### Godot version

4.0 beta 12 mono

### System information

MacOS 13.1, Apple M1 Pro

### Issue description

When `text_editor/external/use_external_editor` is set to true but `text_editor/external/exec_path` is not set and I create a new script and attach it to a node Godot freezes and i need to force quit the application.
Also after a restart when double clicking on the script the application freezes but I can quit normally

### Steps to reproduce

- Set Use External Editor to true in Editor Settings and leave Exec Path empty
- Create a new project with Moblie Renderer and Git Versioning in Godot
- Create a 3D Scene
- Create a gd script in the FileSystem inspector or directly attach the script to a node

### Minimal reproduction project

[New Game Project.zip](https://github.com/godotengine/godot/files/10420510/New.Game.Project.zip)

highlighter->set_text_edit(text_edit);
	highlighter->clear_keyword_colors();
	highlighter->clear_member_keyword_colors();
	highlighter->clear_color_regions();
	highlighter->set_symbol_color(EDITOR_GET("text_editor/theme/highlighting/symbol_color"));
	highlighter->set_function_color(EDITOR_GET("text_editor/theme/highlighting/function_color"));
	highlighter->set_number_color(EDITOR_GET("text_editor/theme/highlighting/number_color"));
	highlighter->set_member_variable_color(EDITOR_GET("text_editor/theme/highlighting/member_variable_color"));
	
	const Color type_color = EDITOR_GET("text_editor/theme/highlighting/engine_type_color");
	List<StringName> types;
	ClassDB::get_class_list(&types);
	for (const StringName &E : types) {
		highlighter->add_keyword_color(E, type_color);
	}
	
	const Color usertype_color = EDITOR_GET("text_editor/theme/highlighting/user_type_color");
	List<StringName> global_classes;
	ScriptServer::get_global_class_list(&global_classes);
	for (const StringName &E : global_classes) {
		highlighter->add_keyword_color(E, usertype_color);
	}
	
	HashMap<StringName, ProjectSettings::AutoloadInfo> autoloads = ProjectSettings::get_singleton()->get_autoload_list();
	for (const KeyValue<StringName, ProjectSettings::AutoloadInfo> &E : autoloads) {
		const ProjectSettings::AutoloadInfo &info = E.value;
		if (info.is_singleton) {