Use Array rather than compact, feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6342#note_17089690

Use Array rather than compact, feedback:
12ef494d · Lin Jen-Shin · ac51fb88 · 12ef494d
Commit 12ef494d authored 8 years ago by Lin Jen-Shin
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -120,7 +120,7 @@ module Ci
    # For now the only user who participates is the user who triggered
    def participants(_current_user = nil)
-      [user].compact
+      Array(user)
    end
    def valid_commit_sha