Summary:
This was broken in D11383. Basically, I had the `ws` module installed globally whilst testing, but the changes made do not work if the `ws` module is installed locally (i.e. in the `./support/aphlict/server/node_modules` directory). After poking around, it seems that this is due to the sandboxing that is done by `JX.require`.
A quick fix is to just //not// use `JX.require`, although you may have a better idea?
The error that is occurring is as follows:
```
<<< UNCAUGHT EXCEPTION! >>>
Error: Cannot find module 'ws'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at extra.require (/usr/src/phabricator/webroot/rsrc/externals/javelin/core/init_node.js:48:16)
at /usr/src/phabricator/support/aphlict/server/lib/AphlictClientServer.js:10:17
at Script.(anonymous function) [as runInNewContext] (vm.js:41:22)
at Object.JX.require (/usr/src/phabricator/webroot/rsrc/externals/javelin/core/init_node.js:58:6)
at Object.<anonymous> (/usr/src/phabricator/support/aphlict/server/aphlict_server.js:102:4)
at Module._compile (module.js:456:26)
>>> Server exited!
```
Test Plan: Now able to start the Aphlict server.
Reviewers: joshuaspence
Reviewed By: joshuaspence
Subscribers: Korvin, epriestley
Maniphest Tasks: T6987
Differential Revision: https://secure.phabricator.com/D11425
Summary:
Ref T6881. Hopefully, this is the hard part.
This adds a new daemon (the "trigger" daemon) which processes triggers, schedules them, and then executes them at the scheduled time. The design is a little complicated, but has these goals:
- High resistance to race conditions: only the application writes to the trigger table; only the daemon writes to the event table. We won't lose events if someone saves a meeting at the same time as we're sending a reminder out for it.
- Execution guarantees: scheduled events are guaranteed to execute exactly once.
- Support for arbitrarily large queues: the daemon will make progress even if there are millions of triggers in queue. The cost to update the queue is proportional to the number of changes in it; the cost to process the queue is proportional to the number of events to execute.
- Relatively good observability: you can monitor the state of the trigger queue reasonably well from the web UI.
- Modular Infrastructure: this is a very low-level construct that Calendar, Phortune, etc., should be able to build on top of.
It doesn't have this stuff yet:
- Not very robust to bad actions: a misbehaving trigger can stop the queue fairly easily. This is OK for now since we aren't planning to make it part of any other applications for a while. We do still get execute-exaclty-once, but it might not happen for a long time (until someone goes and fixes the queue), when we could theoretically continue executing other events.
- Doesn't start automatically: normal users don't need to run this thing yet so I'm not starting it by default.
- Not super well tested: I've vetted the basics but haven't run real workloads through this yet.
- No sophisticated tooling: I added some basic stuff but it's missing some pieces we'll have to build sooner or later, e.g. `bin/trigger cancel` or whatever.
- Intentionally not realtime: This design puts execution guarantees far above realtime concerns, and will not give you precise event execution at 1-second resolution. I think this is the correct goal to pursue architecturally, and certainly correct for subscriptions and meeting reminders. Events which execute after they have become irrelevant can simply decline to do anything (like a meeting reminder which executes after the meeting is over).
In general, the expectation for applications is:
- When creating an object (like a calendar event) that needs to trigger a scheduled action, write a trigger (and save the PHID if you plan to update it later).
- The daemon will process the event and schedule the action efficiently, in a race-free way.
- If you want to move the action, update the trigger and the daemon will take care of it.
- Your action will eventually dump a task into the task queue, and the task daemons will actually perform it.
Test Plan:
Using a test script like this:
```
<?php
require_once 'scripts/__init_script__.php';
$trigger = id(new PhabricatorWorkerTrigger())
->setAction(
new PhabricatorLogTriggerAction(
array(
'message' => 'test',
)))
->setClock(
new PhabricatorMetronomicTriggerClock(
array(
'period' => 33,
)))
->save();
var_dump($trigger);
```
...I queued triggers and ran the daemon:
- Verified triggers fire;
- verified triggers reschedule;
- verified trigger events show up in the web UI;
- tried different periods;
- added some triggers while the daemon was running;
- examined `phd debug` output for anything suspicious.
It seems to work in trivial use case, at least.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T6881
Differential Revision: https://secure.phabricator.com/D11419
Summary: Fixes T5344. Essentially, we only make the AJAX request to `/notification/individual/` if we are the leader tab (i.e. only one tab will make this request). Once a response has been received from the server (containing the contents of the notification), we broadcast the message contents back to all other tabs for rendering.
Test Plan:
Opened two tabs on `/notification/status/` and clicked "Send Test Notification".
**Before**
```lang=bash, name=tail -f /var/log/phabricator-access.log | grep /notification/individual/
[Tue, 13 Jan 2015 20:10:37 +1100] 17033 phabricator 10.0.0.1 josh PhabricatorNotificationIndividualController - /notification/individual/-200 236036
[Tue, 13 Jan 2015 20:10:37 +1100] 17657 phabricator 10.0.0.1 josh PhabricatorNotificationIndividualController - /notification/individual/-200 24130
```
**After**
```lang=bash, name=tail -f /var/log/phabricator-access.log | grep /notification/individual/
[Tue, 13 Jan 2015 20:11:15 +1100] 17657 phabricator 10.0.0.1 josh PhabricatorNotificationIndividualController - /notification/individual/-200 180217
```
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T5344
Differential Revision: https://secure.phabricator.com/D11360
Summary: ...also adds policies on who can view and who can edit an action. Fixes T6949.
Test Plan: viewed a secret through the new UI and it worked
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6949
Differential Revision: https://secure.phabricator.com/D11401
Summary: Just some housekeeping... mostly just removing some unused variables.
Test Plan: Checked that I was still about to receive notifications from `/notification/status/`.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11398
Summary:
For block-level elements that have a margin-top or margin-bottom set
(generally to 12px), also reset the appropriate margin to 0 when
they're a first-child or last-child of their parents.
The change doesn't affect nested lists, their selector is more specific.
Test Plan:
Look at some comments or wiki documents that end with different
block elements, verify that the margins are pretty.
Reviewers: epriestley, #blessed_reviewers, chad
Reviewed By: #blessed_reviewers, chad
Subscribers: Korvin, epriestley
Projects: #remarkup
Maniphest Tasks: T6968
Differential Revision: https://secure.phabricator.com/D11382
Summary: Fixes T6964, makes action links float instead of absolutely positioned.
Test Plan: Tested UIExamples, actions in single line headers, multi line headers, headers with images, workboard headers. Test desktop, mobile, and tablet breakpoints. Long titles wrap as expected as button list grows.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6964
Differential Revision: https://secure.phabricator.com/D11379
Summary: What do you think this is, PHP?
Test Plan: Eyeball it.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11361
Summary:
A refresh of Projects including a new navigations UI.
- New Navigation UI.
- Auto switch default page if Workboard has been initialized
- Move Feed to it's own page
- Increase 'tasks' on Project Home to 50 over 10
- Fix various display bugs on Workboards
- Remove 'crumbs' from Project portal (unneeded).
Test Plan:
- clicked a link for a project with no workboard and saw the profile
- clicked a link for a project with a workboard and saw the workboard
- navigated around the various edit pages, inspecting links and making sure things linked back to the new profile uri
{F266460}
{F266461}
{F266462}
{F266463}
{F266464}
Reviewers: epriestley, btrahan
Reviewed By: epriestley, btrahan
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11272
Summary: Ref D11340, I missed the comments being to excited to land.
Test Plan: Shrink window to mobile view, click on action menu.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11347
Summary: Ref T5752, moves mobile action menus to the object box instead of crumbs.
Test Plan: View action menus at tablet, desktop, and mobile break points. Verify clicking buttons works as expected opening menu.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T5752
Differential Revision: https://secure.phabricator.com/D11340
Summary: Fixes T6937. We weren't passing required parameters.
Test Plan: Followed repro steps in task.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T6937
Differential Revision: https://secure.phabricator.com/D11346
Summary: Fixes T6102. Gets the from D10867 running in the tokenizer. This thing is pretty copy / pastey, but I guess that's okay?
Test Plan: looked at a project //tokenizer// and typed "project". since I have a million things with the word "project" in it, I was delighted to see the "project" project first in this project tokenizer.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6102
Differential Revision: https://secure.phabricator.com/D11305
Summary:
Fixes T4656. Helps users with this naming convention, which is probably not super duper rare.
Users will need to make an edit to a project -or- run bin/search index "#project-tag" to make this actually work.
Test Plan: made a project "[T4656test]". Typed "t4" and project showed up!
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T4656
Differential Revision: https://secure.phabricator.com/D11302
Summary:
Fixes T6559. No more flash, use Websockets. This is less aggressive than the earlier version, and retains more server logic.
- Support "wss".
- Make the client work.
- Remove "notification.user" entirely.
- Seems ok?
Test Plan:
In Safari, Firefox and Chrome, saw the browsers connect. Made a bunch of comments/updates and saw notifications.
Notable holes in the test plan:
- Haven't tested "wss" yet. I'll do this on secure.
- Notifications are //too fast// now, locally. I get them after I hit submit but before the page reloads.
- There are probably some other rough edges, this is a fairly big patch.
Reviewers: joshuaspence, btrahan
Reviewed By: joshuaspence, btrahan
Subscribers: fabe, btrahan, epriestley
Maniphest Tasks: T6713, T6559
Differential Revision: https://secure.phabricator.com/D11143
Summary:
Ref T6713. This isn't very clean, and primarily unblocks D11143.
After D11143, I have a reliable local race where I submit, get a notification immediately, then get a double update (form submission + notification-triggered update).
Instead, make the notification updates wait for form submissions.
This doesn't resolve the race completely. The notification updates don't block chat submission (only the other way around), so if you're really fast you can submit at the same time someone else sends chat and race. But this fixes the most glaring issue.
The overall structure here is still pretty shaky but I tried to improve things a little, at least.
Test Plan: Chatted with myself, saw 0 races instead of 100% races.
Reviewers: btrahan, joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T6713
Differential Revision: https://secure.phabricator.com/D11277
Summary:
Ref T6559. Adds a "JX.Leader" primitive to replace the synchronization over Flash. This does a couple of things:
- Offers an "onBecomeLeader" event, which we can use to open the WebSocket.
- Offers an "onReceiveMessage" event, which we can use to dispatch notifications and handle requests to play sounds and send desktop notifications.
- Offers a "broadcast()" method, which we can use to send desktop notification and sound requests.
Test Plan:
Added some code like this:
```
if (!statics.leader) {
statics.leader = true;
JX.Leader.listen('onBecomeLeader', function() {
JX.log("This tab is now the leader.");
});
JX.Leader.listen('onReceiveBroadcast', function(message, is_leader) {
JX.log('[' + (is_leader ? 'As Leader' : 'Not Leader') + '] ' + message);
});
JX.Leader.start();
}
```
Then:
- Saw first tab open become leader reliably in Safari, Chrome, Firefox.
- Saw new tab become leader reliably when the first tab was closed.
- Saw broadcast() work as documented and deliver messages with correct leadership-flag and uniqueness.
Reviewers: joshuaspence, btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T6559
Differential Revision: https://secure.phabricator.com/D11235
Summary: Ref T6559. Wraps WebSocket in a reasonable driver class which does event dispatch, some state management, and handles automatic reconnect.
Test Plan: In Safari, Firefox and Chrome, connected to a websocket server and sent messages back and forth. Terminated and restarted server, saw automatic reconnects successfully reestablish a connection on all browsers.
Reviewers: btrahan, joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T6559
Differential Revision: https://secure.phabricator.com/D11252
Summary:
Ref T3165. Builds a dedicated index for Conpherence to avoid scale/policy filtering concerns.
- This is pretty one-off but I think it's generally OK.
- There's no UI for it.
- `ConpherenceFulltextQuery` is very low-level. You would need to do another query on the PHIDs it returns to actually show anything to the user.
- The `previousTransactionPHID` is so you can load chat context efficiently. Specifically, if you want to show results like this:
> previous line of context
> **line of chat that matches the query**
> next line of context
...you can read the previous lines out of `previousTransactionPHID` directly, and the next lines by issuing one query with `WHERE previousTransactionPHID IN (...)`.
I'm not 100% sure this is useful, but it seemed like a reasonable thing to provide, since there's no way to query this efficiently otherwise and I figure a lot of chat might make way more sense with a couple of lines of context.
Test Plan:
- Indexed a thread manually (whole thing indexed).
- Indexed a thread by updating it (just the new comment indexed).
- Wrote a hacky test script and got reasonable-looking query results.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T3165
Differential Revision: https://secure.phabricator.com/D11234
Summary: CLosed is a pretty important state and black tends to blend in a bit. This bumps to an alternate color to improve ability to scan and know state of objects.
Test Plan:
Review a number of closed objects. I will follow up with another diff on 'Archived' colors.
{F261895}
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11222
Summary: Increase font size and contrast of all Object Headers.
Test Plan:
Sample a few, find it easier to read. I've been using this locally for a while.
{F261868}
{F261869}
Reviewers: epriestley, btrahan
Reviewed By: btrahan
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11221
Summary: Ref T6861. Some discussion in IRC. The behavior of `sort` is somewhat broken when dealing with mixed types. In this particular case, we have both integers and strings.
Test Plan: @epriestley confirmed that this made the ordering of the Celerity map slightly-more-sane.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6861
Differential Revision: https://secure.phabricator.com/D11210
Summary: Adding a set of 16 icons that match the typeahead icons.
Test Plan: review in photoshop
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6856
Differential Revision: https://secure.phabricator.com/D11183
Summary: Moves from 33% to 50% widths, allows more room for text on smaller screens. (Don't think this gets much use anyways). Fixes T6855
Test Plan: Reload page, shrink, still 50%
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6855
Differential Revision: https://secure.phabricator.com/D11184
Summary: Ref T5655. Fixes T6849. This is another take on D11131, which was missing the DB migration and was reverted in rP7c4de0f6be77ddaea593e1f41ae27211ec179a55.
Test Plan: Ran `./bin/storage upgrade` and verified that the classes were renamed in the `phabricator_policy.policy` table.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6849, T5655
Differential Revision: https://secure.phabricator.com/D11166
Summary: This class is no longer used after D10965.
Test Plan: `grep`
Reviewers: btrahan, epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11133
Summary: Modernize remaining edges to subclass `PhabricatorEdgeType`. Largely based on D11045.
Test Plan: Browsed around and performed various actions include subscribing, unsubscribing and watching.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D11116
Summary: Fixes T6846, cleans up spacing, makes it look scary red.
Test Plan: Fake an exception, see new layout
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6846
Differential Revision: https://secure.phabricator.com/D11161
Summary: If we have a byline, but no attributes, the height of the entire object is off by 4 pixels.
Test Plan: Review list of recent commits, see correct padding.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11128
Summary:
Fixes T6692. Addresses two main issues:
- The write guard would sometimes not get disposed of on exception pathways, generating an unnecessary secondary error which was just a symptom of the original root error.
- This was generally confusing and reduced the quality of reports we received because users would report the symptomatic error sometimes instead of the real error.
- Instead, reflow the handling so that we always dispose of the write guard if we create one.
- If we missed the Controller-level error page generation (normally, a nice page with full CSS, etc), we'd jump straight to Startup-level error page generation (very basic plain text).
- A large class of errors occur too early or too late to be handled by Controller-level pages, but many of these errors are not fundamental, and the plain text page is excessively severe.
- Provide a mid-level simple HTML error page for errors which can't get full CSS, but also aren't so fundamental that we have no recourse but plain text.
Test Plan:
Mid-level errors now produce an intentional-looking error page:
{F259885}
Verified that setup errors still render properly.
@chad, feel free to tweak the exception page -- I just did a rough pass on it. Like the setup error stuff, it doesn't have Celerity, so we can't use `{$colors}` and no other CSS will be loaded.
Reviewers: chad, btrahan
Reviewed By: btrahan
Subscribers: epriestley, chad
Maniphest Tasks: T6692
Differential Revision: https://secure.phabricator.com/D11126
Summary: Modernize Project edges to subclass `PhabricatorEdgeType`. Largely based on D11045.
Test Plan: Add a member to a project, saw new rows in the `phabricator_project.edge` and `phabricator_user.edge` tables.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11111
Summary:
Ref T4411
I'm not quite sure if this is the right place for this as it will be difficult to provide proper user feedback of why we removed a particular subscriber.
Is the ApplicationTransactionEditor generally the right place to extract mentioned phids in comments?
On the other hand in some cases we cannot really give user feedback why a user was not subscribed (e.g.: commits & diffs)
Adding a diff to a repo where the user mentioned has no view permissions the subscriber is currently still added. Still would have to find where this is donet...
Any other places?
Unrelated: Is there any way to remove a subscriber from a commit/audit ?
Test Plan:
- Edited tasks with the mentioned user having view permissions to this specific task and without
- Raised concern with a commit and commented on the audit with the user having view permissions to the repo and without
- Added a commit to a repo with and without the mentioned user having permissions
- Mention a user in a task & commit comment with and without permissions
- Mentioning a user in a diff description & comments with and without permissions to the specific diff
Reviewers: chad, #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: chad, Korvin, epriestley
Maniphest Tasks: T4411
Differential Revision: https://secure.phabricator.com/D11049
Summary: Modernize Differential edges to subclass `PhabricatorEdgeType`. Largely based on D11045.
Test Plan: From previous experience, these changes are fairly trivial and safe. I poked around a little to make sure things looked reasonably okay.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, Krenair, epriestley
Differential Revision: https://secure.phabricator.com/D11074
Summary: T5549
Test Plan: Set edit policy on paste, check that only users meeting the policy requirements can edit it.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Maniphest Tasks: T5549
Differential Revision: https://secure.phabricator.com/D11097
Summary: This should be a local variable, not a global variable. This silences a few JSHint warnings.
Test Plan: `arc lint`
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11070
Summary: This variable should be local, not global. This silences a few JSHint warnings.
Test Plan: `arc lint`
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11068
Summary: This variable should be local, not global. This silences a bunch of JSHint warnings.
Test Plan: `arc lint`
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11067
Summary: This should be a fairly minor change that silences a bunch of JSHint warnings.
Test Plan: `arc lint` showed less warnings.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11064
Summary:
The `show_details` function is used by DarkConsole. Adding this comment silences the following JSHint warning:
```
>>> Lint for webroot/rsrc/js/core/behavior-error-log.js:
Warning (W098) JSHintW098
'show_details' is defined but never used.
5
6 var current_details = null;
7
>>> 8 function show_details(row) {
9 var node = JX.$('row-details-' + row);
10
11 if (current_details !== null) {
```
Test Plan: `arc lint`
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11063
Summary: Currently, `editdata` is implicitly defined as a global variable (and JSHint complains about this). Instead, change it to be a local variable.
Test Plan: `arc lint` showed one less warning.
Reviewers: #blessed_reviewers, epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11062
Summary: Some CSS files are indented inconsistently, with a single space instead of two.
Test Plan: N/A
Reviewers: #blessed_reviewers, epriestley, chad
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11061
Summary: Fixes a few line length linter issues with CSS resources.
Test Plan: `arc lint`
Reviewers: #blessed_reviewers, epriestley, chad
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11060
Summary: Ref T5402. This more or less "fixes" it but there's probably some polish to do?
Test Plan:
stopped and started daemons. error logs look good.
ran bin/storage upgrade. noted that `adjust` added the appropriate indices for active and archive task.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T5402
Differential Revision: https://secure.phabricator.com/D11044
Summary: If the image name in not defined, don't set it. Fixes T6793
Test Plan: View a lightboxed image, no 'undefined' alt tag
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6793
Differential Revision: https://secure.phabricator.com/D11037
