Phriction Action View won't render weird actions when document does not exist

Summary:
The actions wouldn't behave as I want. Disabled them and display "Create Document" instead, since the others make no sense on a non-existing page.

The linking was error-prone btw. `/phriction/edit//` (how it and others would be linked) wouldn't route to anything, and even if, would result in an error anyway since non-existing docs can't be deleted nor have their history shown.

Test Plan:
verified buttons disappeard when document was not created.

verified at least history button would appear when document existed, but was deleted (should work for move, too)

Reviewers: epriestley, chad, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2384

Differential Revision: https://secure.phabricator.com/D5203

src/applications/phriction/controller/PhrictionDocumentController.php

@@ -196,12 +196,21 @@ final class PhrictionDocumentController
 
     $action_view = id(new PhabricatorActionListView())
       ->setUser($user)
-      ->setObject($document)
-      ->addAction(
+      ->setObject($document);
+
+    if (!$document->getID()) {
+      return $action_view->addAction(
         id(new PhabricatorActionView())
-          ->setName(pht('Edit Document'))
-          ->setIcon('edit')
-          ->setHref('/phriction/edit/'.$document->getID().'/'));
+          ->setName(pht('Create this document'))
+          ->setIcon('create')
+          ->setHref('/phriction/edit/?slug='.$slug));
+    }
+
+    $action_view->addAction(
+      id(new PhabricatorActionView())
+        ->setName(pht('Edit Document'))
+        ->setIcon('edit')
+        ->setHref('/phriction/edit/'.$document->getID().'/'));
 
     if ($document->getStatus() == PhrictionDocumentStatus::STATUS_EXISTS) {
       $action_view->addAction(