Fix breaking change in Umb10.2

Author: skttl

src/Our.Umbraco.DocTypeGridEditor/wwwroot/Views/doctypegrideditor.dialog.html

@@ -91,7 +91,7 @@
                     </umb-box>
                 </div>
                 <ng-form val-form-manager ng-switch-when="edit">
-                    <umb-tabbed-content content="vm.content"></umb-tabbed-content>
+                    <umb-tabbed-content content="vm.content" content-node-model="{ variants: [] }"></umb-tabbed-content>
                 </ng-form>
             </div>