Fix some issue with "Move on Workboard" and workboard-less or invisible projects

Summary:
Ref T6027. Fixes T10734.

• 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.

Test Plan:

• Viewed task with project with no columns; no fatal.
• Viewed task with project with disabled board; no options to move on that board.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10734, T6027

Differential Revision: https://secure.phabricator.com/D15640