PR's were merged, but there was a problem when deleting branches

[tadeu]

After a !merge RFDAP-1939 command, it replied with:

Computer says nooo. See logs for details:
400: {'errors': [{'context': 'name', 'message': 'You cannot delete this branch since it has at least one open pull request associated with it', 'exceptionName': 'com.atlassian.bitbucket.internal.branch.UnsupportedOnBranchException'}]}

I've noticed that all 3 pull requests were merged, but the branch wasn't deleted in some repos. The problem was that there was a Pull Request targeting the branch.

There are two things that could be improved:

• The operation could be more atomic, if possible. (Do not merge if there's a problem like this)
• The message could be more helpful, saying what repos have the problem, and what are the possible causes

[gcardozo123]

I'll look at this when I get back to my Github support branch. ;)