### Godot version

master

### System information

Godot v4.2.beta (0ea75d77c) - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2070 (NVIDIA; 31.0.15.3598) - Intel(R) Core(TM) i7-10750H CPU @ 2.60GHz (12 Threads)

### Issue description

When any of the Import, Filesystem, Node, or History docks are floating, changing an editor feature crashes the engine.
Changing any setting or selecting a different profile triggers it.

This is because `EditorNode::_feature_profile_changed` assumes the docks are in a `TabContainer`, and if they are floating they aren't in one.


### Steps to reproduce

Make any of these docks floating: Import, Filesystem, Node, or History
Open Editor Features (Editor -> Manage Editor Features...)
Make a profile (if you have none) or change a setting on the existing profile

### Minimal reproduction project

n/a
popup_pos.y += theme_cache.menu_icon->get_height();
				popup->set_position(popup_pos);
				popup->popup();
				return;
			}
		} else {
			if (popup && pos.x > size.width - theme_cache.menu_icon->get_width()) {
				emit_signal(SNAME("pre_popup_pressed"));
				Vector2 popup_pos = get_screen_position();
				popup_pos.x += size.width - popup->get_size().width;
				popup_pos.y += theme_cache.menu_icon->get_height();
				popup->set_position(popup_pos);
				popup->popup();
				return;
			}
		}
	}
	Ref<InputEventMouseMotion> mm = p_event;
	if (mm.is_valid()) {
		Point2 pos = mm->get_position();
		Size2 size = get_size();
		
		if (pos.y > _get_top_margin()) {
			if (menu_hovered) {
				menu_hovered = false;
				queue_redraw();
			}
			return;
		}
		if (popup) {