80233: Apply Art's feedback

src/app/+item-page/edit-item-page/item-relationships/edit-relationship-list/edit-relationship-list.component.ts

@@ -368,6 +368,7 @@ export class EditRelationshipListComponent implements OnInit, OnDestroy {
         }
 
         // should never happen...
+        console.warn(`The item ${this.item.uuid} is not on the right or the left side of relationship type ${this.relationshipType.uuid}`);
         return undefined;
       })
     );

src/app/core/shared/item.model.ts

@@ -1,4 +1,4 @@
-import { autoserialize, autoserializeAs, deserialize, inheritSerialization } from 'cerialize';
+import { autoserialize, autoserializeAs, deserialize, deserializeAs, inheritSerialization } from 'cerialize';
 import { Observable } from 'rxjs';
 import { isEmpty } from '../../shared/empty.util';
 import { ListableObject } from '../../shared/object-collection/shared/listable-object.model';
@@ -37,7 +37,7 @@ export class Item extends DSpaceObject implements ChildHALResource {
   /**
    * The Date of the last modification of this Item
    */
-  @deserialize
+  @deserializeAs(Date)
   lastModified: Date;
 
   /**