Merge "Handle null buffer when calling Transaction::setBuffer" into tm-dev am: 297bc93384 am: 0a047a06f2 am: 0f0680a2e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/18501030

Change-Id: Ibf9c5a625f08f1f5e9fcea6868266b13c2bd3cf0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>