Active Display: check if recievers and listeners are registered

Change-Id: I1a881aebcbfc2bae92535a4e9ea55ba3789d8b43
Active display: Catch Resources.NotFoundException

This caused the SystemUI to FC when the device was powered and a notification was fired.
Display stayed off and the SystemUI kept restarting until the device was unlocked manually.

Change-Id: Ibfd82242e82aa9ee5c0898f5f0714e490eac0ea9
Active display: Ability to turn off the screen, when a not clearable notification is present
[log]

Change-Id: If90127ceeaf40eefee8a5afa712344f71bda96b9