Fix some issue with "Move on Workboard" and workboard-less or invisible projects
- If one of the projects a task is tagged with isn't visible to the user or doesn't have a board, it won't have columns.
- Don't show options for projects with disabled boards.
- Viewed task with project with no columns; no fatal.
- Viewed task with project with disabled board; no options to move on that board.
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D15640