Handle null carrier config for emergency call hint

getCarrierConfig() is @Nullable. While the default implementation always return a bundle, this is not true for other carrier apps.

ShadowTelephonyManager.getCarrierConfig() now return null as default to catch this behavior.

TEST=TAP
Bug: 80629471
Test: TAP
PiperOrigin-RevId: 199327865
Change-Id: I7416bee3d5f5307919c6825fc74c26f25b6b001f
3 files changed