### Godot version

v4.0.stable.official [92bee43ad]

### System information

Linux - v4.0.stable.official [92bee43ad]

### Issue description

It gives you the possibility of removing unexisting key/value pairs from a dictionary.

### Steps to reproduce

![image](https://github.com/godotengine/godot/assets/69520693/35beadbe-bfdd-4176-9b26-222bbf69cafa)
![image](https://github.com/godotengine/godot/assets/69520693/7ed647e0-a2af-4e58-9f00-f77b7bc7bb02)
![image](https://github.com/godotengine/godot/assets/69520693/f08bf824-8408-45eb-bb84-f1dc7e19e392)


### Minimal reproduction project

N/A
if (changing_type_index < 0) {
		Variant value;
		VariantInternal::initialize(&value, Variant::Type(p_index));
		if (changing_type_index == -1) {
			object->set_new_item_key(value);
		} else {
			object->set_new_item_value(value);
		}
		update_property();
		return;
	}
	Dictionary dict = object->get_dict().duplicate();
	if (p_index < Variant::VARIANT_MAX) {
		Variant value;
		VariantInternal::initialize(&value, Variant::Type(p_index));
		Variant key = dict.get_key_at_index(changing_type_index);
		dict[key] = value;
	} else {
		Variant key = dict.get_key_at_index(changing_type_index);
		dict.erase(key);
	}
	emit_changed(get_edited_property(), dict, "", false);
	update_property();
}
void EditorPropertyDictionary::setup(PropertyHint p_hint) {