d6dc5d8e68
Summary: See <https://discourse.phabricator-community.org/t/removing-tags-or-subscribers-from-a-maniphest-modal-causes-the-modal-to-close/2874>. My Javascript is rusty: `'' + null == 'null'`. Same for `undefined`. Use an explicit typecheck instead. Test Plan: Clicked the "x" in a tokenizer token in a dialog, saw the token removed instead of the dialog closed. Reviewers: amckinley Reviewed By: amckinley Differential Revision: https://secure.phabricator.com/D20623