message: don't break when trying to switch branches off new-content
diff: @@ -155,7 +155,7 @@ export default Ember.Service.extend({
  setBranch(which) {
  let model = this.get('activeContentItem.model')
  - if (model) {
  + if (model && model.get('slug')) {
  let {
  name,
  args,
  