fixed compilation issue with abstract component

src/app/+item-page/edit-item-page/abstract-item-update/abstract-item-update.component.ts

@@ -12,6 +12,10 @@ import { RemoteData } from '../../../core/data/remote-data';
 import { AbstractTrackableComponent } from '../../../shared/trackable/abstract-trackable.component';
 import { environment } from '../../../../environments/environment';
 
+@Component({
+  selector: 'ds-abstract-item-update',
+  template: ''
+})
 /**
  * Abstract component for managing object updates of an item
  */

src/app/+item-page/edit-item-page/edit-item-page.module.ts

@@ -46,6 +46,7 @@ import { ItemVersionHistoryComponent } from './item-version-history/item-version
     EditItemPageComponent,
     ItemOperationComponent,
     AbstractSimpleItemActionComponent,
+    AbstractItemUpdateComponent,
     ModifyItemOverviewComponent,
     ItemWithdrawComponent,
     ItemReinstateComponent,