Frameworks: Be sure heads up view is attached before removing it

We did not have it in our tests but some user ran into it. Thing is if the
system is disabling notifications for whatever reason and till this time the
view was never attached and the system tries to detach the view on windowmanager
we run into an illegal argument exception.

Fix it with simply checking if the view was attached before removing it.

Change-Id: I0800beed3553815cc529087052138345773b32e4
Allow 3 AT (mnc05) to roam on T-Mobile in Austria

Change-Id: Ie1a62db9a48cfaf594ddda7b413299a9b587ddd4

Conflicts:
	core/res/res/values-mcc232-mnc05/config.xml
Tele2 considered non-roaming on T-Mo

Change-Id: Ibb05f277b701861b8716168b54e96f63127e686d

Conflicts:
	core/res/res/values-mcc204-mnc02/config.xml
Vectone UK (MNC01) considered non-roaming on T-Mobile (MNC30)

Change-Id: Id74c854f958be721be12451a124cfd2f8b150255