OO-533: fix RS if the user hasn't selected an item to import in a test

src/main/java/org/olat/modules/qpool/ui/ItemListController.java

@@ -72,6 +72,10 @@ public class ItemListController extends AbstractItemListController {
 	
 	@Override
 	protected void doSelect(UserRequest ureq, ItemRow row) {
-		fireEvent(ureq, new QItemViewEvent("select-item", row));
+		if(row == null) {
+			showWarning("error.select.one");
+		} else {
+			fireEvent(ureq, new QItemViewEvent("select-item", row));
+		}
 	}
 }

src/main/java/org/olat/modules/qpool/ui/events/QItemViewEvent.java

@@ -55,6 +55,9 @@ public class QItemViewEvent extends Event {
 	
 	public List<QuestionItemView> getItemList() {
 		if(itemList == null) {
+			if(item == null) {
+				return Collections.emptyList();
+			}
 			return Collections.singletonList(item);
 		}
 		return itemList;