Add test: Expect 404 on invalid review access.

Review Request #3761 — Created Jan. 18, 2013 and submitted — Latest diff uploaded

Information

nh2
Review Board
master

Reviewers

Add test: Expect 404 on invalid review access.

In particular, test if accessing the screenshots of a nonexistent review id fails.
Fixes #2551.
Test passes with http://reviews.reviewboard.org/r/3767 applied.