campaigns: Handle branches deleted on merge (!10902) · Merge requests · Administrator / sourcegraph

Administrator requested to merge rs/revision-not-found into master May 21, 2020

Created by: ryanslade

It is possible that when we try and fetch the head revision it no longer exists as it has been deleted. This commonly happens after a merge.

Instead, if we can tell that a changeset has been merged we'll try and find the merge commit and use that.

Also, we now signal that is it possible for a head revision not to exist by making it nullable in our API.

campaigns: Handle branches deleted on merge