### Godot version

3.5.1mono

### System information

windows10

### Issue description

Error message
 scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
 scene/main/node.cpp:397 - Parameter "p_child" is null.
 scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).
See "Steps to reproduce for details"

### Steps to reproduce

Set an external text editor
Create a script
Drop the script to the built-in text editor like this image:
![image](https://user-images.githubusercontent.com/119792950/209504041-039f2620-5e42-4c0f-8c41-cd24486fb3d2.png)
And got error message:
 scene/main/node.cpp:1362 - Index p_index = 0 is out of bounds (data.children.size() = 0).
 scene/main/node.cpp:397 - Parameter "p_child" is null.
 scene/gui/tab_container.cpp:593 - Index p_current = 0 is out of bounds (get_tab_count() = 0).

### Minimal reproduction project

An empty project
Node *current = tab_container->get_tab_control(tab_container->get_current_tab());
	EditorHelp *se = Object::cast_to<EditorHelp>(current);
	if (!se) {
		return;
	}
	se->scroll_to_section(help_overview->get_item_metadata(p_idx));
}
void ScriptEditor::_script_selected(int p_idx) {
	grab_focus_block = !Input::get_singleton()->is_mouse_button_pressed(MouseButton::LEFT); 
	_go_to_tab(script_list->get_item_metadata(p_idx));
	grab_focus_block = false;
}
void ScriptEditor::ensure_select_current() {
	if (tab_container->get_tab_count() && tab_container->get_current_tab() >= 0) {
		ScriptEditorBase *se = _get_current_editor();
		if (se) {
			se->enable_editor(this);
			if (!grab_focus_block && is_visible_in_tree()) {
				se->ensure_focus();
			}
		}
	}
	_update_find_replace_bar();
	_update_selected_editor_menu();
}
void ScriptEditor::_find_scripts(Node *p_base, Node *p_current, HashSet<Ref<Script>> &used) {