Right now, you can't move Flow boards to arbitrary locations without flow-create-board (i.e. Flowbot + DannyH). If there are also no Flow namespaces, you can't move anywhere.
If the user lacks flow-create-board, and there are no Flow namespaces, don't show Move tab.
Users who try to move a board get the error seen in the screenshot.
We should take "move" out of the dropdown for users who can't use it.