Don't require mentioned objects to have all required fields when editing comments
Summary: Fixes T12439. This pathway was just missing a setContinueOnMissingFields(...) to skip enforcement of required fields.
Test Plan:
- Added a required custom field.
- Mentioned any task without a field value in a comment.
- Edited that comment.
- Saved changes.
- Before fix: fatal in log.
- After fix: clean edit.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12439
Differential Revision: https://secure.phabricator.com/D17536