R1:cdb8ea27e5a6

Default statuses and priorities to `array()` correctly

Summary: Fixes T7904. Builtin queries won't set these to anything.

Test Plan: "Authored" builtin works again.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T7904

Differential Revision: https://secure.phabricator.com/D12539