message: provide a default so the editor isn't mad
diff: @@ -5,7 +5,7 @@ const { Model, attr } = DS;
  export default Model.extend(TrackRelationships, {
  title: attr('string'),
  - body: attr({ fieldType: '@cardstack/mobiledoc' }),
  + body: attr({ fieldType: '@cardstack/mobiledoc', defaultValue: emptyMobiledoc }),
  created: attr('date'),
  street: attr('string'),
  city: attr('string'),
  @@ -19,5 +19,23 @@ export default Model.extend(TrackRelationships, {
  // `model.constructor.modelName` in a template to get this. It
  // works if you provide this computed property.
  return this.constructor.modelName;
  - })
  + }),
  +
  + init() {
  + this._super.apply(this, arguments);
  + }
  });
  +
  +function emptyMobiledoc() {
  + return {
  + version: "0.3.1",
  + markups: [],
  + atoms: [],
  + cards: [],
  + sections: [
  + [1, "p", [
  + [0, [], 0, ""]
  + ]]
  + ]
  + };
  +}
  