### 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 (p_property == "new_item_key") {
		object->set_new_item_key(p_value);
	} else if (p_property == "new_item_value") {
		object->set_new_item_value(p_value);
	} else if (p_property.begins_with("indices")) {
		int index = p_property.get_slice("/", 1).to_int();
		Dictionary dict = object->get_dict().duplicate();
		Variant key = dict.get_key_at_index(index);
		dict[key] = p_value;
		object->set_dict(dict);
		emit_changed(get_edited_property(), dict, "", true);
	}
}
void EditorPropertyDictionary::_change_type(Object *p_button, int p_index) {