### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Godot v4.2.dev3 - macOS 13.4.1 - Vulkan (Forward+) - integrated Apple M1 - Apple M1 (8 Threads)

### Issue description

The content is empty. In the list `<Select Importer> `should be preselected, if possible. 
Or directly show the settings for "Animation Library" (check first selection).


![Bildschirmfoto 2023-08-22 um 01 29 44](https://github.com/godotengine/godot/assets/41921395/8300a756-ff54-4310-a0ad-04ad9525aeb9)


### Steps to reproduce

1. Project
2. Project Settings
3. Import Defaults 

https://github.com/godotengine/godot/assets/41921395/cb263c7d-27f0-4053-a555-0ed03ac7ef2a



### Minimal reproduction project

N/A
settings->importer = importer;
	if (importer.is_valid()) {
		List<ResourceImporter::ImportOption> options;
		importer->get_import_options("", &options);
		Dictionary d;
		if (ProjectSettings::get_singleton()->has_setting("importer_defaults/" + importer->get_importer_name())) {
			d = GLOBAL_GET("importer_defaults/" + importer->get_importer_name());
		}
		for (const ResourceImporter::ImportOption &E : options) {
			settings->properties.push_back(E.option);
			if (d.has(E.option.name)) {
				settings->values[E.option.name] = d[E.option.name];
			} else {
				settings->values[E.option.name] = E.default_value;
			}
			settings->default_values[E.option.name] = E.default_value;
		}
		save_defaults->set_disabled(false);
		reset_defaults->set_disabled(false);
	} else {
		save_defaults->set_disabled(true);
		reset_defaults->set_disabled(true);
	}
	settings->notify_property_list_changed();
	
	
	inspector->set_object_class(importer->get_class_name());
	inspector->edit(settings);
}
void ImportDefaultsEditor::_importer_selected(int p_index) {