Merge branch 'fix-related-branches-error-500' into 'master'

Fix typo causing related branches to Error 500

From Sentry: https://sentry.gitlap.com/gitlab/gitlabcom/issues/6154/

See merge request !4611

app/views/projects/issues/_related_branches.html.haml

@@ -6,7 +6,7 @@
       %li
         - sha = @project.repository.find_branch(branch).target
         - pipeline = @project.pipeline(sha, branch) if sha
-        - if ci_copipelinemmit
+        - if pipeline
           %span.related-branch-ci-status
             = render_pipeline_status(pipeline)
         %span.related-branch-info