Reject PUT with a changenum on file-only review requests.
Review Request #6311 — Created Sept. 10, 2014 and submitted — Latest diff uploaded
When updating a file-only review request (which doesn't have a repository), it
was possible to pass in a changenum field, which would then cause a 500 error
trying to fetch the scmtool. This change makes it so that we return
INVALID_CHANGE_NUMBERif there's no repository (since they're all invalid).
- Ran unit tests.
- Used cURL to reproduce the original bug and saw that I got an error message
instead of a 500.