Checkmk Werk 13435: Fix 500 errors on BI rule endpoints

ID: 13435 Title: Fix 500 errors on BI rule endpoints Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 Deleting a rule which is a dependency of another rule returned a 500 status code, now returns 409 Deleting a rule returned a 500 status code "permission mismatch", now returns 204 Deleting a non existing rule returned a 500 status code, now returns 404