Don't link to removed ref

app/views/events/_event_push.html.haml

@@ -5,6 +5,9 @@
   .event-title
     %strong.author_name #{event.author_name}
     %span.event_label.pushed #{event.push_action_name} #{event.ref_type}
+    - if event.rm_ref?
+      %strong= event.ref_name
+    - else
       = link_to project_commits_path(event.project, event.ref_name) do
         %strong= event.ref_name
     at