Merge pull request DSpace#2861 from DSpace/backport-2777-to-dspace-7_x

[Port dspace-7_x] Element reference for typeahead directive is only defined when model has authority

Author: tdonohue

src/app/shared/form/builder/ds-dynamic-form-ui/models/tag/dynamic-tag.component.ts

@@ -151,7 +151,7 @@ export class DsDynamicTagComponent extends DsDynamicVocabularyComponent implemen
    * @param event The value to emit.
    */
   onBlur(event: Event) {
-    if (isNotEmpty(this.currentValue) && !this.instance.isPopupOpen()) {
+    if (isNotEmpty(this.currentValue) && (!this.model.hasAuthority || !this.instance.isPopupOpen())) {
       this.addTagsToChips();
     }
     this.blur.emit(event);