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: I8812baf0de0ad021497dccef378f41bbe69939c3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>