R1:ad38252c6811

Fix fatal on setting default profile picture

Summary: I thought I fixed this but must have not saved in my editor or something. Fixes T3552.

Test Plan: Set profile image to default.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3552

Differential Revision: https://secure.phabricator.com/D6477