### 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
String prop_name;
			Variant key;
			Variant value;
			if (i < amount) {
				prop_name = "indices/" + itos(i + offset);
				key = dict.get_key_at_index(i + offset);
				value = dict.get_value_at_index(i + offset);
			} else if (i == amount) {
				prop_name = "new_item_key";
				value = object->get_new_item_key();
			} else if (i == amount + 1) {
				prop_name = "new_item_value";
				value = object->get_new_item_value();
			}
			EditorProperty *prop = nullptr;
			switch (value.get_type()) {
				case Variant::NIL: {
					prop = memnew(EditorPropertyNil);
				} break;
				
				case Variant::BOOL: {
					prop = memnew(EditorPropertyCheck);
				} break;
				case Variant::INT: {
					EditorPropertyInteger *editor = memnew(EditorPropertyInteger);
					editor->setup(-100000, 100000, 1, false, true, true);
					prop = editor;
				} break;
				case Variant::FLOAT: {
					EditorPropertyFloat *editor = memnew(EditorPropertyFloat);