### 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
case Variant::PACKED_FLOAT64_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_FLOAT64_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_STRING_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_STRING_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_VECTOR2_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_VECTOR2_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_VECTOR3_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_VECTOR3_ARRAY);
					prop = editor;
				} break;
				case Variant::PACKED_COLOR_ARRAY: {
					EditorPropertyArray *editor = memnew(EditorPropertyArray);
					editor->setup(Variant::PACKED_COLOR_ARRAY);
					prop = editor;
				} break;
				default: {
				}
			}
			ERR_FAIL_COND(!prop);
			prop->set_read_only(is_read_only());