### 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.
}
		if (export_preset.is_null()) {
			Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
			if (da->file_exists("res:export_presets.cfg")) {
				err = FAILED;
				export_error = vformat(
						"Invalid export preset name: %s.\nThe following presets were detected in this project's `export_presets.cfg`:\n\n",
						preset_name);
				for (int i = 0; i < EditorExport::get_singleton()->get_export_preset_count(); ++i) {
					
					export_error += vformat("        \"%s\"\n", EditorExport::get_singleton()->get_export_preset(i)->get_name());
				}
			} else {
				err = FAILED;
				export_error = "This project doesn't have an `export_presets.cfg` file at its root.\nCreate an export preset from the \"Project > Export\" dialog and try again.";
			}
		} else {
			Ref<EditorExportPlatform> platform = export_preset->get_platform();
			const String export_path = export_defer.path.is_empty() ? export_preset->get_export_path() : export_defer.path;
			if (export_path.is_empty()) {
				err = FAILED;
				export_error = vformat("Export preset \"%s\" doesn't have a default export path, and none was specified.", preset_name);
			} else if (platform.is_null()) {
				err = FAILED;
				export_error = vformat("Export preset \"%s\" doesn't have a matching platform.", preset_name);
			} else {
				if (export_defer.pack_only) { 
					if (export_path.ends_with(".zip")) {
						err = platform->export_zip(export_preset, export_defer.debug, export_path);
					} else if (export_path.ends_with(".pck")) {