def key_exists(dictionary, *keys):
    """Check if key exist in a nested dictionary.

    :param dictionary: Nested dicionary
    :type dictionary: dict
    :param keys: Keys to test agains the dictionary
    :type keys: args
    :return: ``True`` if at least one key is in the dicionary
    :rtype: bool
    :raise KeyError: If no key is in the dictionary
    """
    item = dictionary
    for key in keys:
        try:
            item = item[key]
        except KeyError:
            return False
    return True
