message: Make sure non-200 case is handled gracefully
diff: @@ -108,6 +108,9 @@ export default Service.extend({
  let response = await fetch(url, {
  headers: this._headers()
  });
  + if (response.status !== 200) {
  + return;
  + }
  let { data } = await response.json();
  let { attributes, relationships } = data;
  return {
  