In very specific circumstances we can bulkDistribute 0 notices

Seems to be what caused an infinite loop on quitter.es, or I guess so anyway.

plugins/OStatus/classes/HubSub.php

@@ -249,7 +249,7 @@ class HubSub extends Managed_DataObject
      * @param string $atom well-formed Atom feed
      * @param array $pushCallbacks list of callback URLs
      */
-    function bulkDistribute($atom, $pushCallbacks)
+    function bulkDistribute($atom, array $pushCallbacks)
     {
         $data = array('atom' => $atom,
                       'topic' => $this->getTopic(),

plugins/OStatus/lib/ostatusqueuehandler.php

@@ -255,7 +255,7 @@ class OStatusQueueHandler extends QueueHandler
                 }
             }
         }
-        if (count($batch) >= 0) {
+        if (count($batch) > 0) {
             $sub->bulkDistribute($atom, $batch);
         }
     }