catch possible RuntimeExcpetion instead of breaking the phone app

02-25 14:38:18.571 E/AndroidRuntime(2354): FATAL EXCEPTION: Thread-165
02-25 14:38:18.571 E/AndroidRuntime(2354): java.lang.RuntimeException: Method called after release()
02-25 14:38:18.571 E/AndroidRuntime(2354): at android.media.ToneGenerator.stopTone(Native Method)
02-25 14:38:18.571 E/AndroidRuntime(2354): at com.android.phone.CallNotifier.run

Change-Id: Ie1c4c404d7174b74575d0be750d16ff3bd779181