Fix NullPointerException, TelephonyManager.getServiceState is null
Add the null protect for TelephonyManager.getServiceState. Bug: 166676020 Test: 1. make RunSettingsRoboTests ROBOTEST_FILTER=\ RenameMobileNetworkDialogFragmentTest (PASS) 2. make RunSettingsRoboTests ROBOTEST_FILTER=\ AutoSelectPreferenceControllerTest (PASS) 3. make RunSettingsRoboTests ROBOTEST_FILTER=\ PreferredNetworkModePreferenceControllerTest (PASS) 4. make RunSettingsRoboTests ROBOTEST_FILTER=\ EnabledNetworkModePreferenceControllerTest (PASS) Change-Id: I61e59f7ba9d6c64019d620d6cb80099ded41473f
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