Set a default paste header

Summary: Fixes T4040

Test Plan: Create new paste without title, see title.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4040

Differential Revision: https://secure.phabricator.com/D7605

src/applications/paste/controller/PhabricatorPasteViewController.php

@@ -157,8 +157,10 @@ final class PhabricatorPasteViewController extends PhabricatorPasteController {
   }
 
   private function buildHeaderView(PhabricatorPaste $paste) {
+    $title = (nonempty($paste->getTitle())) ?
+      $paste->getTitle() : pht('(An Untitled Masterwork)');
     $header = id(new PHUIHeaderView())
-      ->setHeader($paste->getTitle())
+      ->setHeader($title)
       ->setUser($this->getRequest()->getUser())
       ->setPolicyObject($paste);