### 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
array = p_array;
}
Variant EditorPropertyArrayObject::get_array() {
	return array;
}
EditorPropertyArrayObject::EditorPropertyArrayObject() {
}
bool EditorPropertyDictionaryObject::_set(const StringName &p_name, const Variant &p_value) {
	String name = p_name;
	if (name == "new_item_key") {
		new_item_key = p_value;
		return true;
	}
	if (name == "new_item_value") {
		new_item_value = p_value;
		return true;
	}
	if (name.begins_with("indices")) {
		int index = name.get_slicec('/', 1).to_int();
		Variant key = dict.get_key_at_index(index);
		dict[key] = p_value;
		return true;
	}
	return false;
}
bool EditorPropertyDictionaryObject::_get(const StringName &p_name, Variant &r_ret) const {