Merge request comments disappear when topic is published
After a topic is published, returning to the merge request where some discussion has happened we get an empty page with :
We cannot render this merge request properly because topic/default/topic-1 does not exist in org/repo
Please close Merge Request or change branches with existing one
I think the merge request was between two topics see https://heptapod.octobus.net/heptapod/heptapod/issues/39#note_337