### 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.
const Size2 add_button_size = Size2(0, scene_tabs->get_size().y);
	if (scene_tabs->get_offset_buttons_visible()) {
		
		if (scene_tab_add->get_parent() == scene_tabs) {
			scene_tabs->remove_child(scene_tab_add);
			scene_tab_add_ph->add_child(scene_tab_add);
			scene_tab_add->set_rect(Rect2(Point2(), add_button_size));
		}
	} else {
		
		if (scene_tab_add->get_parent() == scene_tab_add_ph) {
			scene_tab_add_ph->remove_child(scene_tab_add);
			scene_tabs->add_child(scene_tab_add);
		}
		if (scene_tabs->get_tab_count() == 0) {
			scene_tab_add->set_rect(Rect2(Point2(), add_button_size));
			return;
		}
		Rect2 last_tab = scene_tabs->get_tab_rect(scene_tabs->get_tab_count() - 1);
		int hsep = scene_tabs->get_theme_constant(SNAME("h_separation"));
		if (scene_tabs->is_layout_rtl()) {
			scene_tab_add->set_rect(Rect2(Point2(last_tab.position.x - scene_tab_add->get_size().x - hsep, last_tab.position.y), add_button_size));
		} else {
			scene_tab_add->set_rect(Rect2(Point2(last_tab.position.x + last_tab.size.width + hsep, last_tab.position.y), add_button_size));
		}
	}
	
	scene_tabs->connect("tab_changed", callable_mp(this, &EditorNode::_scene_tab_changed));
}
void EditorNode::_version_control_menu_option(int p_idx) {