Merge "Make sure empty TaskFragment notify organizer" into tm-dev am: 597b031c am: 81eca7ea am: c6d436c0 am: 8bac9521

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18085612



Change-Id: Ic9b4972758e37436e736e1cefb6af5f615eb5f14
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>