Fix all remaining weird Diffusion request processing

Summary: Ref T4245. This is the last of it, and covers the clone/push stuff.

Test Plan:
  - Cloned git.
  - Pushed git.
  - Cloned mercurial.
  - Pushed mercurial.
  - Visited a `blah.git` URL in my browser just because; got redirected to a human-facing UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4245

Differential Revision: https://secure.phabricator.com/D14949

src/applications/diffusion/controller/DiffusionRepositoryEditController.php

@@ -6,8 +6,9 @@ abstract class DiffusionRepositoryEditController
   protected function buildApplicationCrumbs($is_main = false) {
     $crumbs = parent::buildApplicationCrumbs();
 
-    if ($this->diffusionRequest) {
-      $repository = $this->getDiffusionRequest()->getRepository();
+    if ($this->hasDiffusionRequest()) {
+      $drequest = $this->getDiffusionRequest();
+      $repository = $drequest->getRepository();
       $repo_uri = $repository->getURI();
       $edit_uri = $this->getRepositoryControllerURI($repository, 'edit/');