Merge "Do a null check before returning the primary providers" into udc-dev am: cc87e369

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23035616



Change-Id: Iac46711cdff6024f22a6fbf4bb82efd72478acbc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>