### 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.
}
	if (p_clear_errors) {
		load_errors->clear();
	}
	String lpath = ProjectSettings::get_singleton()->localize_path(p_scene);
	if (!lpath.begins_with("res:")) {
		show_accept(TTR("Error loading scene, it must be inside the project path. Use 'Import' to open the scene, then save it inside the project path."), TTR("OK"));
		opening_prev = false;
		return ERR_FILE_NOT_FOUND;
	}
	int prev = editor_data.get_edited_scene();
	int idx = editor_data.add_edited_scene(-1);
	if (!editor_data.get_edited_scene_root() && editor_data.get_edited_scene_count() == 2) {
		_remove_edited_scene();
	} else if (!p_silent_change_tab) {
		_scene_tab_changed(idx);
	} else {
		set_current_scene(idx);
	}
	dependency_errors.clear();
	Error err;
	Ref<PackedScene> sdata = ResourceLoader::load(lpath, "", ResourceFormatLoader::CACHE_MODE_REPLACE, &err);
	if (!sdata.is_valid()) {
		_dialog_display_load_error(lpath, err);
		opening_prev = false;
		if (prev != -1) {
			set_current_scene(prev);
			editor_data.remove_scene(idx);
		}
		return ERR_FILE_NOT_FOUND;