Determines if there is a log config in the config directory
       and returns it. If it does not exist, return None.

    Returns:
        log_config (dict): The dictionary to pass to logging.config.dictConfig

def _get_config():
    """Determines if there is a log config in the config directory
       and returns it. If it does not exist, return None.

    Returns:
        log_config (dict): The dictionary to pass to logging.config.dictConfig
    """
    conf_file = os.path.join(_get_config_dir(), 'log_config.toml')
    if os.path.exists(conf_file):
        with open(conf_file) as fd:
            raw_config = fd.read()
        log_config = toml.loads(raw_config)
        return log_config

    conf_file = os.path.join(_get_config_dir(), 'log_config.yaml')
    if os.path.exists(conf_file):
        with open(conf_file) as fd:
            raw_config = fd.read()
        log_config = yaml.safe_load(raw_config)
        return log_config

    return None