Pholio phixes

Summary: Fixes T3573 and T3541. (Note T3573 is only fixed moving forward as I changed how transactions are converted in the editor.)

Test Plan: created mocks with combinations of set and empty image title and descriptions. verified when i updated title / description transactions showed up. called up the email via command line tools and saw nice 'created' text.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3541, T3573

Differential Revision: https://secure.phabricator.com/D6495