Fix Diffusion change view header

Summary: See D7162. This was like 99% my fault. Just provide a header; the new ones look pretty reasonable.

Test Plan: Viewed Diffusion change view, no exception.

Reviewers: vrana, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D7183

src/applications/diffusion/controller/DiffusionChangeController.php

@@ -37,6 +37,7 @@ final class DiffusionChangeController extends DiffusionController {
     );
 
     $changeset_view = new DifferentialChangesetListView();
+    $changeset_view->setTitle(pht('Change'));
     $changeset_view->setChangesets($changesets);
     $changeset_view->setVisibleChangesets($changesets);
     $changeset_view->setRenderingReferences(