re-use files if you forget to name a mock
Summary: good title
Test Plan: made a mock with no title and the files i had attached showed up again correctly. named the mock and it worked!
Reviewers: epriestley, chad
Reviewed By: chad
CC: aran, Korvin
Maniphest Tasks: T2642
Differential Revision: https://secure.phabricator.com/D5261