Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ee

CHANGELOG-EE

+v 7.12 (Unreleased)
+  - Fix error when viewing merge request with a commit that includes "Closes #<issue id>".
+
 v 7.11.2
   - Fixed license upload and verification mechanism
 

app/views/help/index.html.haml

 %div
   %h1
     GitLab
-    %span.light Enterprise Edition
+    Enterprise Edition
     %span= Gitlab::VERSION
     %small= Gitlab::REVISION
     - if current_application_settings.version_check_enabled

lib/gitlab/reference_extractor.rb

@@ -23,7 +23,7 @@ module Gitlab
     end
 
     def issues
-      if project.default_issues_tracker?
+      if project.nil? || project.default_issues_tracker?
         result = pipeline_result(:issue)
       elsif project.jira_tracker?
         result = pipeline_result(:external_issue)