add missing data attribute for existing query group

app/views/types/form/_query_group.html.erb

@@ -1,6 +1,7 @@
 <div class="type-form-conf-group type-form-query-group"
      data-original-key="<%= group.key.to_s %>"
-     data-key="<%= group.key %>">
+     data-key="<%= group.key %>"
+     data-key-is-symbol="<%= group.key.is_a? Symbol %>">
   <div class="group-head">
     <span class="group-handle icon-toggle"></span>
     <group-edit-in-place

frontend/app/components/types/form-configuration/types-form-configuration.controller.ts

@@ -162,7 +162,7 @@ function typesFormConfigurationCtrl(
     let currentQuery = originator.data('queryProps');
 
     return currentQuery || persistentQuery || {};
-  }
+  };
 
   $scope.updateHiddenFields = ():boolean => {
     let groups:HTMLElement[] = angular.element('.type-form-conf-group').not('#type-form-conf-group-template').toArray();