Merge "Null phone check when checking if radio is off for thermal mitigation." into sc-qpr1-dev am: 070541b7cc am: 5268864cab am: 45a208b8cf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/15531684

Change-Id: I1dc1fa09105044306adb6d39763d0d452ee20131