Merge "libbinder_ndk: toString never goes to empty strings." am: 8e2b0f7444 am: bd7dc6e9ce

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2315865

Change-Id: I34bae238be7c08d5b2a8df1d43563c08c58209d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>