Merge "Migrate from android::String isEmpty to empty" into main am: 18560efc30

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2705823

Change-Id: I0e36482d480ab8396c42095239e88f560f4d1d99
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>