### 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
p_breakpoints->push_back(base + ":" + itos((int)bpoints[j] + 1));
		}
	}
	
	List<String> cached_editors;
	script_editor_cache->get_sections(&cached_editors);
	for (const String &E : cached_editors) {
		if (loaded_scripts.has(E)) {
			continue;
		}
		Array breakpoints = _get_cached_breakpoints_for_script(E);
		for (int i = 0; i < breakpoints.size(); i++) {
			p_breakpoints->push_back(E + ":" + itos((int)breakpoints[i] + 1));
		}
	}
}
void ScriptEditor::_members_overview_selected(int p_idx) {
	ScriptEditorBase *se = _get_current_editor();
	if (!se) {
		return;
	}
	
	
	se->goto_line(members_overview->get_item_metadata(p_idx));
	Dictionary state = se->get_edit_state();
	state["column"] = 0;
	state["scroll_position"] = members_overview->get_item_metadata(p_idx);
	se->set_edit_state(state);
}
void ScriptEditor::_help_overview_selected(int p_idx) {