Unpublished review requests keep their summary, description, and diff

on the draft, so rbt info showed an empty review request. It now

shows the draft for unpublished review requests. For published review

requests, the draft is shown when the current user is the submitter.
A draft diff counts as the newest diff revision, and its commits are

listed from the draft commits resource.

Ran rbt info for an unpublished draft review request.