Summary:
Fixes T7229. Some usability issues around this controller - basically you can't leave comments with it and its not particular useful compared to the revision page.
Ergo, if there is a revision associated with a given diff, just re-direct back to the revision page with the proper diff loaded.
Test Plan: Tried to view a diff on the standalone controller attached to a revision and instead was re-directed to the revision view page with the proper diff loaded.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7229
Differential Revision: https://secure.phabricator.com/D11811
1d72a5f683