Fix flakiness of testHasCarrierPrivilegesViaCarrierConfigs.

testHasCarrierPrivilegesViaCarrierConfigs may fail if current carrier
config is null in overrideConfig method. Adding a null check to avoid
it.

Bug: 146163445
Test: atest CtsTelephonyTestCases:TelephonyManagerTest
Change-Id: I1debb28a5f8ed0f97af1ff5c642d224189bd6a25
Merged-In: I1debb28a5f8ed0f97af1ff5c642d224189bd6a25
1 file changed