### Godot version

4.1.beta (7b1387ff2)

### System information

Mageia 9, Linux

### Issue description

When opening an empty project in latest `master`, I get these errors:
```
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: get_scene_path (editor/scu/../editor_data.cpp:880)
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: check_and_update_scene (editor/scu/../editor_data.cpp:683)
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: set_edited_scene (editor/scu/../editor_data.cpp:745)
```

Possibly related to recent changes to restore past sessions, but there's nothing to restore in this case?

### Steps to reproduce

- Create a new project, edit it
- Quit to project manager
- Re-open the newly created project -> errors

### Minimal reproduction project

Empty project.
}
	}
	file->set_file_mode(EditorFileDialog::FILE_MODE_SAVE_FILE);
	saving_resource = p_resource;
	current_menu_option = RESOURCE_SAVE_AS;
	List<String> extensions;
	Ref<PackedScene> sd = memnew(PackedScene);
	ResourceSaver::get_recognized_extensions(p_resource, &extensions);
	file->clear_filters();
	List<String> preferred;
	for (const String &E : extensions) {
		if (p_resource->is_class("Script") && (E == "tres" || E == "res")) {
			
			continue;
		}
		file->add_filter("*." + E, E.to_upper());
		preferred.push_back(E);
	}
	
	List<String>::Element *res_element = preferred.find("res");
	if (res_element) {
		preferred.move_to_back(res_element);
	}
	
	List<String>::Element *tres_element = preferred.find("tres");
	if (tres_element) {
		preferred.move_to_front(tres_element);
	}
	if (!p_at_path.is_empty()) {
		file->set_current_dir(p_at_path);