BusyIndicator now supports manually setting visibility when there are no linkable targets.
BusyIndicator now supports manually setting visibility when there are
no linkable targets.

Change-Id: Id28d5a63bc91ef72eb03376749303334c1df20b9

WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS,WeaveTeam/WeaveJS