### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
add_type_options->clear();
	List<StringName> names;
	ThemeDB::get_singleton()->get_default_theme()->get_type_list(&names);
	if (include_own_types) {
		edited_theme->get_type_list(&names);
	}
	names.sort_custom<StringName::AlphCompare>();
	Vector<StringName> unique_names;
	for (const StringName &E : names) {
		
		if (!p_filter.is_subsequence_ofn(String(E))) {
			continue;
		}
		
		if (unique_names.has(E)) {
			continue;
		}
		unique_names.append(E);
		Ref<Texture2D> item_icon;
		if (E == "") {
			item_icon = get_theme_icon(SNAME("NodeDisabled"), SNAME("EditorIcons"));
		} else {
			item_icon = EditorNode::get_singleton()->get_class_icon(E, "NodeDisabled");
		}
		add_type_options->add_item(E, item_icon);
	}
}
void ThemeTypeDialog::_add_type_filter_cbk(const String &p_value) {