### 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
if (tool != TOOL_RULER) {
		return;
	}
	if (ruler_tool_active) {
		Color ruler_primary_color = get_theme_color(SNAME("accent_color"), SNAME("Editor"));
		Color ruler_secondary_color = ruler_primary_color;
		ruler_secondary_color.a = 0.5;
		Point2 begin = (ruler_tool_origin - view_offset) * zoom;
		Point2 end = snap_point(viewport->get_local_mouse_position() / zoom + view_offset) * zoom - view_offset * zoom;