Merge branch 'ci-pipeline-doesnt-require-project' into 'master'

Don't fail when Ci::Pipeline doesn't have a project

Fixes https://sentry.gitlap.com/gitlab/gitlabcom/issues/8870/

See merge request !5288

app/models/ci/pipeline.rb

@@ -215,6 +215,8 @@ module Ci
     end
 
     def keep_around_commits
+      return unless project
+      
       project.repository.keep_around(self.sha)
       project.repository.keep_around(self.before_sha)
     end