### 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
String str = TS->format_number(vformat("%d " + TTR("px"), p_value));
	if (p_value != 0) {
		_draw_text_at_position(p_position, str, p_side);
	}
}
void CanvasItemEditor::_draw_percentage_at_position(real_t p_value, Point2 p_position, Side p_side) {
	String str = TS->format_number(vformat("%.1f ", p_value * 100.0)) + TS->percent_sign();
	if (p_value != 0) {
		_draw_text_at_position(p_position, str, p_side);
	}
}
void CanvasItemEditor::_draw_focus() {
	
	if (viewport->has_focus()) {
		get_theme_stylebox(SNAME("FocusViewport"), SNAME("EditorStyles"))->draw(viewport->get_canvas_item(), Rect2(Point2(), viewport->get_size()));
	}
}
void CanvasItemEditor::_draw_guides() {