### 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
if (text_file.is_valid()) {
			edit(text_file, true);
			return;
		}
		
	} else if (path.contains("::")) {
		
		String res_path = path.get_slice("::", 0);
		if (ResourceLoader::get_resource_type(res_path) == "PackedScene") {
			if (!EditorNode::get_singleton()->is_scene_open(res_path)) {
				EditorNode::get_singleton()->load_scene(res_path);
			}
		} else {
			EditorNode::get_singleton()->load_resource(res_path);
		}
		Ref<Script> scr = ResourceLoader::load(path);
		if (scr.is_valid()) {
			edit(scr, true);
			return;
		}
	} else if (!path.is_resource_file()) {
		_help_class_open(path);
		return;
	}
	rc.remove_at(p_idx);
	EditorSettings::get_singleton()->set_project_metadata("recent_files", "scripts", rc);
	_update_recent_scripts();
	_show_error_dialog(path);
}
void ScriptEditor::_show_error_dialog(String p_path) {