Steps to reproduce:

1. Have a user that is a screen owner
2. Call the api endpoint to delete said user https://www.zabbix.com/documentation/3.0/manual/api/reference/user/delete

Result:
200 OK
{'code': -32602, 'message': 'Invalid params.', 'data': 'User "sohl_prod" is screen "Rabbit cluster" owner.'}
Expected:
4xx error returned