[automerger skipped] Don't crash if default supervision profile owner is not...

[automerger skipped] Don't crash if default supervision profile owner is not set am: b5fa0a6c am: cb447a87 -s ours am: c9e26473 -s ours

am skip reason: Merged-In If441946fa278c04ae88122f6243f5a7dedd96ebc with SHA-1 bcb5ee6f is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16460072

Change-Id: Iefe8798b6b9d8f0994c63b97a96fd91cad95c56a