Merge branch 'merge-request-widget' into 'master'

Fix missing commit status for widget when no CI service is enabled

Fix for #3082 

/cc @dzaporozhets 

See merge request !1621

app/views/projects/merge_requests/widget/_heading.html.haml

-- if @merge_request.has_ci?
-  - ci_commit = @merge_request.source_project.ci_commit(@merge_request.source_sha)
-  - if ci_commit
+- ci_commit = @merge_request.source_project.ci_commit(@merge_request.source_sha)
+- if ci_commit
   - status = ci_commit.status
   .mr-widget-heading
     .ci_widget{class: "ci-#{status}"}
@@ -10,7 +9,7 @@
       %span.ci-coverage
       = link_to "View build details", ci_status_path(ci_commit)
 
-  - else
+- elsif @merge_request.has_ci?
   - # Compatibility with old CI integrations (ex jenkins) when you request status from CI server via AJAX
   - # Remove in later versions when services like Jenkins will set CI status via Commit status API
   .mr-widget-heading