Merge "Migrate from android::String isEmpty to empty [bootanimation]" into main am: 1de5695524

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2725975

Change-Id: I6a1fedc371d908046174c3b52546569925ca8054
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>