### 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
ScriptEditorBase *se = Object::cast_to<ScriptEditorBase>(tab_container->get_tab_control(i));
		if (se && se->get_edit_menu()) {
			if (current) {
				se->get_edit_menu()->show();
			} else {
				se->get_edit_menu()->hide();
			}
		}
	}
	EditorHelp *eh = Object::cast_to<EditorHelp>(tab_container->get_current_tab_control());
	script_search_menu->get_popup()->clear();
	if (eh) {
		script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/find", TTR("Find..."), KeyModifierMask::CMD_OR_CTRL | Key::F), HELP_SEARCH_FIND);
		script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/find_next", TTR("Find Next"), Key::F3), HELP_SEARCH_FIND_NEXT);
		script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/find_previous", TTR("Find Previous"), KeyModifierMask::SHIFT | Key::F3), HELP_SEARCH_FIND_PREVIOUS);
		script_search_menu->get_popup()->add_separator();
		script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/find_in_files", TTR("Find in Files"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::F), SEARCH_IN_FILES);
		script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/replace_in_files", TTR("Replace in Files"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::R), REPLACE_IN_FILES);
		script_search_menu->show();
	} else {
		if (tab_container->get_tab_count() == 0) {
			script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/find_in_files", TTR("Find in Files"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::F), SEARCH_IN_FILES);
			script_search_menu->get_popup()->add_shortcut(ED_SHORTCUT("script_editor/replace_in_files", TTR("Replace in Files"), KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT | Key::R), REPLACE_IN_FILES);
			script_search_menu->show();
		} else {
			script_search_menu->hide();
		}
	}
}
void ScriptEditor::_update_history_pos(int p_new_pos) {