Don't crash if default supervision profile owner is not set

Bug: 175430552
Bug: 197399948
Test: build, flash, watch logcat

Change-Id: If441946fa278c04ae88122f6243f5a7dedd96ebc
Merged-In: If441946fa278c04ae88122f6243f5a7dedd96ebc
(cherry picked from commit bd27c36)
(cherry picked from commit bcb5ee6)
(cherry picked from commit b5fa0a6)
Merged-In:If441946fa278c04ae88122f6243f5a7dedd96ebc

Author: Tomasz Wasilczyk

services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java

@@ -9424,6 +9424,9 @@ && isProfileOwnerOfOrganizationOwnedDevice(userInfo.id)) {
             final ComponentName doComponent = mOwners.getDeviceOwnerComponent();
             final ComponentName poComponent =
                     mOwners.getProfileOwnerComponent(userHandle.getIdentifier());
+            if (supervisorComponent == null) {
+                return null;
+            }
             if (supervisorComponent.equals(doComponent) || supervisorComponent.equals(
                     poComponent)) {
                 return supervisorComponent;