R1:03d0e3fdbc89

Fix fatal in Conpherence NUX state

Summary: Fixes T12619.

Test Plan: Faked `return array()` in ConpherneceThreadQuery, got a NUX instead of fatal.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12619

Differential Revision: https://secure.phabricator.com/D17764