Merge "Ignore empty tasks when unfreezing recents list after timeout" into udc-dev am: ebba1751

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22497407



Change-Id: I48d8b68d848ebf6e7c2c357178c240769704099d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>