[diffusion] Fix pending differential revisions list

Summary:
DifferentialRevisionListView requires setFields to be called before
calling getRequiredHandlePHIDs; this adds that call for DiffusionController

Test Plan:
loaded diffusion and saw the "Pending Differential Revisions" section
populated, and no errors in the darkconsole

Reviewers: epriestley, btrahan, jungejason

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1665

src/applications/diffusion/controller/base/DiffusionController.php

@@ -143,6 +143,7 @@ abstract class DiffusionController extends PhabricatorController {
 
     $view = id(new DifferentialRevisionListView())
       ->setRevisions($revisions)
+      ->setFields(DifferentialRevisionListView::getDefaultFields())
       ->setUser($this->getRequest()->getUser());
 
     $phids = $view->getRequiredHandlePHIDs();