Audit - another partial fix to commit re-parsing bug

Summary: Ref T6350. We build $sql based on whose subscribed. If no one is subscribed, then we have no query to run.

Test Plan: observed one error disappearing from my daemon log. Also, more doing it live.

Reviewers: epriestley, chad

Reviewed By: chad

Subscribers: Korvin, epriestley

Maniphest Tasks: T6350

Differential Revision: https://secure.phabricator.com/D10731

src/applications/feed/PhabricatorFeedStoryPublisher.php

@@ -164,12 +164,15 @@ final class PhabricatorFeedStoryPublisher {
         $mark_read);
     }
 
-    queryfx(
-      $conn,
-      'INSERT INTO %T (primaryObjectPHID, userPHID, chronologicalKey, hasViewed)
-        VALUES %Q',
-      $notif->getTableName(),
-      implode(', ', $sql));
+    if ($sql) {
+      queryfx(
+        $conn,
+        'INSERT INTO %T '.
+        '(primaryObjectPHID, userPHID, chronologicalKey, hasViewed) '.
+        'VALUES %Q',
+        $notif->getTableName(),
+        implode(', ', $sql));
+    }
   }
 
   private function sendNotification($chrono_key, array $subscribed_phids) {