Provide a sane error if encountering multiple conflicting repositories.
Review Request #7459 — Created June 26, 2015 and submitted — Latest diff uploaded
If two repositories conflict (one has a Mirror Path matching the Path of
another repository), then validating a diff or creating a review request
in the API will result in an HTTP 500 error, due to a
MultipleObjectsReturnedexception.We now check for this and provide a more reasonable error message
instead, with a suggestion for how to resolve the issue.
Unit tests pass.