check if files are array

Author: Paurikova2

src/app/item-page/simple/field-components/preview-section/preview-section.component.html

@@ -1,6 +1,6 @@
 <ng-container *ngIf="(listOfFiles | async) as files; else loading">
   <!-- Show "No files" message -->
-  <div *ngIf="files.length === 0" class="text-center text-muted my-3">
+  <div *ngIf="isArrayAndEmpty(files) && files.length === 0" class="text-center text-muted my-3">
     {{ 'item.view.box.no-files.message' | translate }}
   </div>
 

src/app/item-page/simple/field-components/preview-section/preview-section.component.ts

@@ -32,5 +32,7 @@ export class PreviewSectionComponent implements OnInit {
     });
   }
 
-
+  isArrayAndEmpty(value: unknown): boolean {
+    return Array.isArray(value) && value.length === 0;
+  }
 }