### 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
}
				for (CanvasItem *E : selitems) {
					editor_selection->add_node(E);
				}
			}
			_reset_drag();
			viewport->queue_redraw();
			return true;
		}
		if (b.is_valid() && b->is_pressed() && b->get_button_index() == MouseButton::RIGHT) {
			
			_reset_drag();
			viewport->queue_redraw();
			return true;
		}
		if (m.is_valid()) {
			
			box_selecting_to = transform.affine_inverse().xform(m->get_position());
			viewport->queue_redraw();
			return true;
		}
	}
	if (k.is_valid() && k->is_pressed() && k->get_keycode() == Key::ESCAPE && drag_type == DRAG_NONE && tool == TOOL_SELECT) {
		
		editor_selection->clear();
		viewport->queue_redraw();
	}
	return false;
}
bool CanvasItemEditor::_gui_input_ruler_tool(const Ref<InputEvent> &p_event) {