Merge "Check for null buffer when calling Transaction#setBuffer" into tm-dev...

Merge "Check for null buffer when calling Transaction#setBuffer" into tm-dev am: 4c850d74 am: 6be188e0 am: ac07fea5 am: 4c65e7f9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18501090



Change-Id: I29ead65f514a79cf1b96b7255b26542a3297cd18
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>