Merge "Handle null buffer when calling Transaction::setBuffer" into tm-dev am: 297bc93384 am: b016cb444d

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

Change-Id: I8fe01b04a321b5c9367657c71cd52e1d3a0f5c82
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>