Handle errors in successful notes reply (EE-port)
EE-port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28082
What does this MR do?
Add missing error handling for successful backend responses of the notes endpoint that contain errors.
EE-port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28082
Add missing error handling for successful backend responses of the notes endpoint that contain errors.