Token - fix fatal for installs with no tokens yet given

Summary: fixes github issue 326

Test Plan: visited /token/leaders and observed no fatals.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6021

src/applications/tokens/controller/PhabricatorTokenLeaderController.php

@@ -16,6 +16,7 @@ final class PhabricatorTokenLeaderController
     $counts = $query->getTokenCounts();
 
     $handles = array();
+    $phids = array();
     if ($counts) {
       $phids = mpull($objects, 'getPHID');
       $handles = id(new PhabricatorObjectHandleData($phids))