add NullPointerCheck for serviceStateTracker
ServiceStateTracker is not created inside GsmCdmaPhone, thus there is no SST inside SipPhone. Add a null pointer check inside CarrierActionAgent. In the long term we should move CarrierActionSignal and CarrierSignalAgent from Phone to GsmCdmaPhone Bug: 64104240 Test: Manaul test by making a SIP call Change-Id: Ia48ff128c9656446058816043cc825a1f60c8a20
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