[automerger skipped] Fix possible NPE for UNKNOWN code path am: ad4b0bb8 -s...

[automerger skipped] Fix possible NPE for UNKNOWN code path am: ad4b0bb8 -s ours am: 34e51113 -s ours

am skip reason: Merged-In I89b52553990bf58b8af304bab0bdd4cd8e8cb017 with SHA-1 86ac7ac6 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/16065241

Change-Id: I2c856fa21c47e56f7420ef3f3f18d395acfe0df4