Don't allow adding Objects to the project settings

Godot doesn't support serializing objects.

This closes godotengine#33667.

editor/project_settings_editor.cpp

@@ -381,9 +381,12 @@ ProjectSettingsEditor::ProjectSettingsEditor(EditorData *p_data) {
  type->set_custom_minimum_size(Size2(100, 0) * EDSCALE);
  hbc->add_child(type);
 
- // Start at 1 to avoid adding "Nil" as an option
- for (int i = 1; i < Variant::VARIANT_MAX; i++) {
- type->add_item(Variant::get_type_name(Variant::Type(i)));
+ for (int i = 0; i < Variant::VARIANT_MAX; i++) {
+ // There's no point in adding Nil types, and Object types
+ // can't be serialized correctly in the project settings.
+ if (i != Variant::NIL && i != Variant::OBJECT) {
+ type->add_item(Variant::get_type_name(Variant::Type(i)));
+ }
  }
 
  l = memnew(Label);