[automerger skipped] Add a null check to prevent NullPointerException am:...

[automerger skipped] Add a null check to prevent NullPointerException am: 10039a47 -s ours am: 10ec350e -s ours am: df0f0586 -s ours am: 3d9827b8 -s ours

am skip reason: Change-Id I5d5e98add0ea2abf92156c11188739c535e7e9a8 with SHA-1 c4b59dd6 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/11702815

Change-Id: Ie4aa75f9e265126ac3d45810f3d60d6ca5e82836