Merge "Don't crash if default supervision profile owner is not set" into sc-dev

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

@@ -8817,6 +8817,9 @@ public class DevicePolicyManagerService extends BaseIDevicePolicyManager {
                 return null;
             }
             final ComponentName supervisorComponent = ComponentName.unflattenFromString(supervisor);
+            if (supervisorComponent == null) {
+                return null;
+            }
             if (supervisorComponent.equals(doComponent) || supervisorComponent.equals(
                     poComponent)) {
                 return supervisorComponent;