Telephony: Fix exception if PROPERTY_OPERATOR_NUMERIC is not set

and minor fixes.

Fix the following
 - When PROPERTY_OPERATOR_NUMERIC is not set, the value is "" when CDMAPhone
is initialized. The constructor tries to extract MCC and MNC from this
property and results in a StringIndexOutOfBounds exception. Check for empty
OperatorNumeric string before trying to extract MCC and MNC
 - Handle RIL_REQUEST_REPORT_STK_SERVICE_IS_RUNNING response gracefully.

Change-Id: I749d6801bb4794d56e8fd672dec69dfea2b5c756