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

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

Change-Id: I37b6093ffca0e2ad3534bfd110432b183cc09c07
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>