[EE] Fix reference filters in group context
This is EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18340 (to see if EE-only epic-related tests pass).
Closes #5631 (closed)
Edited by Coung Ngo
This is EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18340 (to see if EE-only epic-related tests pass).
Closes #5631 (closed)