Prevent crash attaching a script with no languages registered

editor/scene_tree_dock.cpp

@@ -2557,6 +2557,11 @@ void SceneTreeDock::_focus_node() {
 }
 
 void SceneTreeDock::attach_script_to_selected(bool p_extend) {
+	if (ScriptServer::get_language_count() == 0) {
+		EditorNode::get_singleton()->show_warning(TTR("Cannot attach a script: there are no languages registered.\nThis is probably because this editor was built with all language modules disabled."));
+		return;
+	}
+
 	if (!profile_allow_script_editing) {
 		return;
 	}

editor/script_create_dialog.cpp

@@ -783,7 +783,7 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	gc->add_child(memnew(Label(TTR("Language:"))));
 	gc->add_child(language_menu);
 
-	default_language = 0;
+	default_language = -1;
 	for (int i = 0; i < ScriptServer::get_language_count(); i++) {
 		String lang = ScriptServer::get_language(i)->get_name();
 		language_menu->add_item(lang);
@@ -791,8 +791,9 @@ ScriptCreateDialog::ScriptCreateDialog() {
 			default_language = i;
 		}
 	}
-
-	language_menu->select(default_language);
+	if (default_language >= 0) {
+		language_menu->select(default_language);
+	}
 	current_language = default_language;
 
 	language_menu->connect("item_selected", callable_mp(this, &ScriptCreateDialog::_lang_changed));