### 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 *current = _get_current_editor();
	if (current) {
		Ref<Script> scr = current->get_edited_resource();
		return scr != nullptr ? scr : nullptr;
	} else {
		return nullptr;
	}
}
TypedArray<Script> ScriptEditor::_get_open_scripts() const {
	TypedArray<Script> ret;
	Vector<Ref<Script>> scripts = get_open_scripts();
	int scrits_amount = scripts.size();
	for (int idx_script = 0; idx_script < scrits_amount; idx_script++) {
		ret.push_back(scripts[idx_script]);
	}
	return ret;
}
bool ScriptEditor::toggle_scripts_panel() {
	list_split->set_visible(!list_split->is_visible());
	EditorSettings::get_singleton()->set_project_metadata("scripts_panel", "show_scripts_panel", list_split->is_visible());
	return list_split->is_visible();
}
bool ScriptEditor::is_scripts_panel_toggled() {