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

[automerger skipped] Add a null check to prevent NullPointerException am: 10039a47 am: e3e707a3 -s ours am: 9ba324f6 -s ours am: a2379fa6 -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: I0efb06fc1f588b5e01324c6b329a39f5ca10a99f