Settings: Catch NPE caused by attempting to invoke virtual method  on a null object reference

Change-Id: I86ae0f7b46b12533190228404e0bed406d85b2e6
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
Forward port SMS rate limit setting

Change-Id: Ie8fea98e9e24b0f6302eaed22af9241f85ca965