### 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.
Script *script = Object::cast_to<Script>(p_object);
	if (!script) {
		return false;
	}
	return script->get_language()->overrides_external_editor();
}
void EditorNode::_edit_current(bool p_skip_foreign) {
	ObjectID current_id = editor_history.get_current();
	Object *current_obj = current_id.is_valid() ? ObjectDB::get_instance(current_id) : nullptr;
	Ref<Resource> res = Object::cast_to<Resource>(current_obj);
	if (p_skip_foreign && res.is_valid()) {
		if (res->get_path().find("::") > -1 && res->get_path().get_slice("::", 0) != editor_data.get_scene_path(get_current_tab())) {
			
			current_obj = nullptr;
		}
	}
	bool inspector_only = editor_history.is_current_inspector_only();
	this->current = current_obj;
	if (!current_obj) {
		SceneTreeDock::get_singleton()->set_selected(nullptr);
		InspectorDock::get_inspector_singleton()->edit(nullptr);
		NodeDock::get_singleton()->set_node(nullptr);
		InspectorDock::get_singleton()->update(nullptr);
		hide_unused_editors();
		return;
	}
	Object *prev_inspected_object = InspectorDock::get_inspector_singleton()->get_edited_object();
	bool disable_folding = bool(EDITOR_GET("interface/inspector/disable_folding"));