Merge "Migrate from android::String isEmpty to empty [bootanimation]" into...

Merge "Migrate from android::String isEmpty to empty [bootanimation]" into main am: 1de56955 am: 757b0507 am: 94faa189 am: 4d51bc3d

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



Change-Id: I2e7e38a18b2242505d512b46072dfd4cbd2d7f4c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>