camera aidl: 'empty' native handles not 'null' native handles am: 29b87463f4 am: eea598ddce am: 13d8d11900 am: 94fd5f2e30

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

Change-Id: Ib426525357057b4bee061a99751b74f7010a7df7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>