### 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
}
		if (export_preset.is_null()) {
			Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
			if (da->file_exists("res:export_presets.cfg")) {
				err = FAILED;
				export_error = vformat(
						"Invalid export preset name: %s.\nThe following presets were detected in this project's `export_presets.cfg`:\n\n",
						preset_name);
				for (int i = 0; i < EditorExport::get_singleton()->get_export_preset_count(); ++i) {
					
					export_error += vformat("        \"%s\"\n", EditorExport::get_singleton()->get_export_preset(i)->get_name());
				}
			} else {
				err = FAILED;
				export_error = "This project doesn't have an `export_presets.cfg` file at its root.\nCreate an export preset from the \"Project > Export\" dialog and try again.";
			}
		} else {
			Ref<EditorExportPlatform> platform = export_preset->get_platform();
			const String export_path = export_defer.path.is_empty() ? export_preset->get_export_path() : export_defer.path;
			if (export_path.is_empty()) {
				err = FAILED;
				export_error = vformat("Export preset \"%s\" doesn't have a default export path, and none was specified.", preset_name);
			} else if (platform.is_null()) {
				err = FAILED;
				export_error = vformat("Export preset \"%s\" doesn't have a matching platform.", preset_name);
			} else {
				if (export_defer.pack_only) { 
					if (export_path.ends_with(".zip")) {
						err = platform->export_zip(export_preset, export_defer.debug, export_path);
					} else if (export_path.ends_with(".pck")) {