Fix null pointer in SubscriptionUtil

Sometimes we get null sub info which causes a crash. This just
makes it so that if we see that we treat it as inactive since
there isn't really a world where an active null sub info makes
sense.

Test: atest SubscriptionUtilTest
Bug: 131603073
Change-Id: Id5ecbecf011e19ff02d9465e0571b1d17c83de9a