code: function(){
      var EmptyView = Marionette.getOption(this, "emptyView");
  
      if (EmptyView && !this._showingEmptyView){
        this._showingEmptyView = true;
        var model = new Backbone.Model();
        this.addItemView(model, EmptyView, 0);
      }
    }
docs: Internal method to show an empty view in place of a collection of item views, when the collection is empty