### 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.
for (int i = 0; i < plugins_list.size(); i++) {
		plugins_list[i]->make_visible(p_visible);
	}
}
void EditorPluginList::edit(Object *p_object) {
	for (int i = 0; i < plugins_list.size(); i++) {
		plugins_list[i]->edit(p_object);
	}
}
bool EditorPluginList::forward_gui_input(const Ref<InputEvent> &p_event) {
	bool discard = false;
	for (int i = 0; i < plugins_list.size(); i++) {
		if (plugins_list[i]->forward_canvas_gui_input(p_event)) {
			discard = true;
		}
	}
	return discard;
}
EditorPlugin::AfterGUIInput EditorPluginList::forward_3d_gui_input(Camera3D *p_camera, const Ref<InputEvent> &p_event, bool serve_when_force_input_enabled) {