### 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
Node *scene = editor_data.get_edited_scene_root();
	if (!scene) {
		return;
	}
	List<String> esl;
	p_config_file->get_section_keys("editor_states", &esl);
	Dictionary md;
	for (const String &E : esl) {
		Variant st = p_config_file->get_value("editor_states", E);
		if (st.get_type() != Variant::NIL) {
			md[E] = st;
		}
	}
	editor_data.set_editor_plugin_states(md);
}
void EditorNode::_save_editor_states(const String &p_file, int p_idx) {