Merge "Call onDismissed on dismiss even mUserSwitchingDialog is null." into udc-dev am: 3cb27206 am: 9760c0a7 am: 6b4b549b am: 949697af

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23289736



Change-Id: I6ff72e4b0ba3ce0cb54d917ad5627b61f73d13f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>