R1:4921f3f13b86

Fix warnings for undefined $next_step and $verb

Summary: Revisions don't necessarily have a backing repository, as in "--raw".

Test Plan: Looked at a "--raw" revision in accepted and closed states.

Reviewers: nh, btrahan

Reviewed By: nh

CC: aran

Differential Revision: https://secure.phabricator.com/D2444