Merge "Migrate from android::String isEmpty to empty" into udc-dev-plus-aosp am: 07fd56cc13

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24541337

Change-Id: I2e3a595d972a6bf8cb0ec634b1d3c372fd4bbd61
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>