[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: d9537a76 -s ours am: 2555c0e4 -s ours am: 262f3826 -s ours

am skip reason: Merged-In If441946fa278c04ae88122f6243f5a7dedd96ebc with SHA-1 b5fa0a6c is already in history

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

Change-Id: Ideb2033a6030dbc226a161c9b21ad5f4cdc41d3d