Fix of uninitialized isAdmin handling

Author: jr-rk

src/app/item-page/simple/field-components/clarin-item-versions-field/clarin-item-versions-field.component.ts

@@ -56,7 +56,7 @@ export class ClarinItemVersionsFieldComponent extends ItemVersionsComponent impl
       );
     } else {
       // Fallback: check if isAdmin$ is available, otherwise hide the component
-      this.showMetadataValue = this.isAdmin$ || of(false);
+      this.showMetadataValue = this.isAdmin$ ? this.isAdmin$ : of(false);
     }
   }