Merge "Avoid crash when no work profile files app is set" into udc-dev am: 2bc270ac

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22163303



Change-Id: I6c221ab84e72e14a0415ee036b4f227734c1dcec
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>