Merge "Migrate from android::String isEmpty to empty" into main am: 80429eeee0

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2707597

Change-Id: I3925561c8e0d48b2e895826f5bbcff88755b3799
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>