Create module folder with empty __init__.py if it doesn't exist.

        Args:
            folder (pathlib.Path): Module path.

def _check_module(folder):
        """Create module folder with empty __init__.py if it doesn't exist.

        Args:
            folder (pathlib.Path): Module path.
        """
        if not folder.exists():
            folder.mkdir(parents=True, exist_ok=True, mode=0o755)
            (folder / '__init__.py').touch()