### 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.
}
		Node3D *node_3d = Object::cast_to<Node3D>(p_node);
		if (node_3d) {
			new_additive_node_entry.transform_3d = node_3d->get_relative_transform(node_3d->get_parent());
		}
		
		HashMap<Node *, Node *> ownership_table;
		for (int i = 0; i < p_node->get_child_count(); i++) {
			Node *child = p_node->get_child(i);
			update_ownership_table_for_addition_node_ancestors(child, ownership_table);
		}
		new_additive_node_entry.ownership_table = ownership_table;
		p_addition_list.push_back(new_additive_node_entry);
		return;
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *child = p_node->get_child(i);
		update_diff_data_for_node(p_edited_scene, p_root, child, p_modification_table, p_addition_list);
	}
}
void EditorNode::open_request(const String &p_path) {
	if (!opening_prev) {
		List<String>::Element *prev_scene_item = previous_scenes.find(p_path);
		if (prev_scene_item != nullptr) {
			prev_scene_item->erase();
		}
	}
	load_scene(p_path); 
}
void EditorNode::edit_foreign_resource(Ref<Resource> p_resource) {