### 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.
switch (vcs_actions_menu->get_item_id(p_idx)) {
		case RUN_VCS_METADATA: {
			VersionControlEditorPlugin::get_singleton()->popup_vcs_metadata_dialog();
		} break;
		case RUN_VCS_SETTINGS: {
			VersionControlEditorPlugin::get_singleton()->popup_vcs_set_up_dialog(gui_base);
		} break;
	}
}
void EditorNode::_update_title() {
	const String appname = GLOBAL_GET("application/config/name");
	String title = (appname.is_empty() ? TTR("Unnamed Project") : appname);
	const String edited = editor_data.get_edited_scene_root() ? editor_data.get_edited_scene_root()->get_scene_file_path() : String();
	if (!edited.is_empty()) {
		
		title = vformat("%s - %s", edited.get_file(), title);
	}
	if (unsaved_cache) {
		
		title = vformat("(*) %s", title);
	}
	DisplayServer::get_singleton()->window_set_title(title + String(" - ") + VERSION_NAME);
	if (project_title) {
		project_title->set_text(title);
	}
}
void EditorNode::shortcut_input(const Ref<InputEvent> &p_event) {