Merge "Do not create starting window if there is no task." into tm-qpr-dev am: 050781d7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18527307



Change-Id: I1c0088ddd9b9bf6032bc5d9441f930ec4c96d8a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>