Do not update state of Disconnected Connection

Add a check in TelephonyConnection#updateStateInternal to make sure that
its Connection is not null before trying to update its state. This can
happen when reseting the Connection state override for an outgoing CDMA
call.

Bug: 27250284
Change-Id: Iff765977b5b57d6cb6d52d70e5780a2215318fc3
1 file changed