Check for null subscription info list in TelecomUtil#getSubscriptionInfo.

The javadoc for the method states that it can return null if the current state is unknown.

Bug: 70224613
Test: unit
PiperOrigin-RevId: 178020566
Change-Id: I4cd6f76b7c0572d1c9797eba4bf9c3981846468e
1 file changed