Implemented fallback for unimplemented notifications with silly message.

Summary:
Most notifications are not implemented, a fallback message should
be displayed for these cases.

Test Plan: Commented out renderNotificationView in PhabricatorFeedStoryManiphest and watched the notifications render.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: ddfisher, keebuhm, aran, Korvin

Differential Revision: https://secure.phabricator.com/D2700

src/applications/feed/story/PhabricatorFeedStory.php

@@ -29,8 +29,11 @@ abstract class PhabricatorFeedStory {
 
   abstract public function renderView();
 
-//  TODO: Restore this once subclasses actually implement it.
-//  abstract public function renderNotificationView();
+//  TODO: Make abstract once all subclasses implement it.
+  public function renderNotificationView() {
+    return id(new PhabricatorFeedStoryUnknown($this->data))
+      ->renderNotificationView();
+  }
 
   public function getRequiredHandlePHIDs() {
     return array();

src/applications/feed/story/PhabricatorFeedStoryUnknown.php

@@ -34,4 +34,21 @@ final class PhabricatorFeedStoryUnknown extends PhabricatorFeedStory {
     return $view;
   }
 
+  public function renderNotificationView() {
+    $data = $this->getStoryData();
+
+    $view = new PhabricatorNotificationStoryView();
+
+    $view->setTitle('A wild notifcation appeared!');
+    $view->setEpoch($data->getEpoch());
+
+    $view->appendChild(
+      'This is an unrenderable feed story of type '.
+      '"'.phutil_escape_html($data->getStoryType()).'".');
+
+
+    return $view;
+
+  }
+
 }