camera aidl: 'empty' native handles not 'null' native handles am: 29b87463

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2250554



Change-Id: I2148508663f577884f2352d6de5580f277b968e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>