Fix issue where keyguard reports a valid token but doesn't draw

This fixes an issue where keyguard isn't showing but tells
PhoneWindowManager to wait anyway.  The fix is to send a null token
when keyguard isn't showing.

Fixes bug 11216030

Change-Id: I4985fe50c63819415d9d5a1de0b741c8aa6391d8
1 file changed