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

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



Change-Id: I6a4571c4048164efc04bf482a056dfef64a32662
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>