Don't throw error when repo can't be find

When visiting page of repo that doesn't exist, we should not throw an
error. It still does not work as expected, redirecting to
/undefined/undefined, which should be addressed as well, but at least we
don't throw errors now.

assets/scripts/app/routes.coffee

@@ -204,7 +204,7 @@ Travis.Router = Ember.Router.extend
         dynamicSegmentPattern: "([^/#]+)"
 
         connectOutlets: (router, repo) ->
-          unless repo.constructor == Travis.Repo
+          if repo && repo.constructor != Travis.Repo
             repo = Travis.Repo.find(repo.id)
           router.get('repoController').set 'repo', repo