Prevent awarding/revoking tokens when a task is locked
Summary: Ref T12335. Allows you to lock tasks to keep your precious tokens.
Test Plan:
- Awarded tokens to an unlocked task.
- Locked the task.
- Could no longer award/rescind tokens.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12335
Differential Revision: https://secure.phabricator.com/D17461