Pipeline#user could be nil. Feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6342#note_16956937

Pipeline#user could be nil. Feedback:
776877c2 · Lin Jen-Shin · 6bab69aa · 776877c2
Commit 776877c2 authored 8 years ago by Lin Jen-Shin
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -116,7 +116,7 @@ module Ci
  
    # For now the only user who participates is the user who triggered
    def participants(_current_user = nil)
-      [user]
+      [user].compact
    end
  
    def valid_commit_sha