### 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
if (importer.is_null()) {
			return;
		}
		for (const PropertyInfo &E : properties) {
			if (importer->get_option_visibility("", E.name, values)) {
				p_list->push_back(E);
			}
		}
	}
};
void ImportDefaultsEditor::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_PREDELETE: {
			inspector->edit(nullptr);
		} break;
	}
}
void ImportDefaultsEditor::_reset() {
	if (settings->importer.is_valid()) {
		settings->values = settings->default_values;
		settings->notify_property_list_changed();
	}
}
void ImportDefaultsEditor::_save() {