Determine if `repo_directory` contains a `cookiecutter.json` file.

    :param repo_directory: The candidate repository directory.
    :return: True if the `repo_directory` is valid, else False.

def repository_has_cookiecutter_json(repo_directory):
    """Determine if `repo_directory` contains a `cookiecutter.json` file.

    :param repo_directory: The candidate repository directory.
    :return: True if the `repo_directory` is valid, else False.
    """
    repo_directory_exists = os.path.isdir(repo_directory)

    repo_config_exists = os.path.isfile(
        os.path.join(repo_directory, 'cookiecutter.json')
    )
    return repo_directory_exists and repo_config_exists