### 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
resource_conversion_plugins.push_back(p_plugin);
}
void EditorNode::remove_resource_conversion_plugin(const Ref<EditorResourceConversionPlugin> &p_plugin) {
	resource_conversion_plugins.erase(p_plugin);
}
Vector<Ref<EditorResourceConversionPlugin>> EditorNode::find_resource_conversion_plugin(const Ref<Resource> &p_for_resource) {
	Vector<Ref<EditorResourceConversionPlugin>> ret;
	for (int i = 0; i < resource_conversion_plugins.size(); i++) {
		if (resource_conversion_plugins[i].is_valid() && resource_conversion_plugins[i]->handles(p_for_resource)) {
			ret.push_back(resource_conversion_plugins[i]);
		}
	}
	return ret;
}
void EditorNode::_bottom_panel_raise_toggled(bool p_pressed) {
	top_split->set_visible(!p_pressed);
}
void EditorNode::_update_renderer_color() {
	String rendering_method = renderer->get_selected_metadata();
	if (rendering_method == "forward_plus") {
		renderer->add_theme_color_override("font_color", Color::hex(0x5d8c3fff));
	}
	if (rendering_method == "mobile") {
		renderer->add_theme_color_override("font_color", Color::hex(0xa5557dff));
	}
	if (rendering_method == "gl_compatibility") {
		renderer->add_theme_color_override("font_color", Color::hex(0x5586a4ff));
	}
}
void EditorNode::_renderer_selected(int p_which) {