LibGUI: Add fallible factories to ItemListModel

Author: https://github.com/thankyouverycool
Commit: 8dda4e4ab5
Pull-request: https://github.com/SerenityOS/serenity/pull/18764
Reviewed-by: https://github.com/caoimhebyrne ✅

Userland/Libraries/LibGUI/ItemListModel.h

@@ -36,6 +36,17 @@ public:
         return adopt_ref(*new ItemListModel<T, Container>(data, row_count));
     }
 
+    static ErrorOr<NonnullRefPtr<ItemListModel>> try_create(Container const& data, ColumnNamesT const& column_names, Optional<size_t> const& row_count = {})
+    requires(IsTwoDimensional)
+    {
+        return adopt_nonnull_ref_or_enomem(new (nothrow) ItemListModel<T, Container, ColumnNameListType>(data, column_names, row_count));
+    }
+    static ErrorOr<NonnullRefPtr<ItemListModel>> try_create(Container const& data, Optional<size_t> const& row_count = {})
+    requires(!IsTwoDimensional)
+    {
+        return adopt_nonnull_ref_or_enomem(new (nothrow) ItemListModel<T, Container>(data, row_count));
+    }
+
     virtual ~ItemListModel() override = default;
 
     virtual int row_count(ModelIndex const& index) const override