Merge "JNI: check if callback object is null before invoking it" into tm-qpr-dev am: 1f71f21f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/20411893



Change-Id: I214c7cc33740683ba7da626ad220e6cbf86b2236
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>