Make searching by tags work in Phriction
Summary: Fixes T12860. Some joins were being dropped because we didn't call parent::...
- Tagged a document.
- Searched for documents with that tag.
- Before change: got all documents.
- After change: got only tagged documents.
Reviewed By: chad
Maniphest Tasks: T12860
Differential Revision: https://secure.phabricator.com/D18145