Parse ISBN and EAN.

    Args:
        details (obj): HTMLElement containing slice of the page with details.

    Returns:
        (ISBN, EAN): Tuple with two string or two None.

def _parse_ISBN_EAN(details):
    """
    Parse ISBN and EAN.

    Args:
        details (obj): HTMLElement containing slice of the page with details.

    Returns:
        (ISBN, EAN): Tuple with two string or two None.
    """
    isbn_ean = _get_td_or_none(
        details,
        "ctl00_ContentPlaceHolder1_tblRowIsbnEan"
    )

    if not isbn_ean:
        return None, None

    ean = None
    isbn = None
    if "/" in isbn_ean:  # ISBN and EAN are stored in same string
        isbn, ean = isbn_ean.split("/")
        isbn = isbn.strip()
        ean = ean.strip()
    else:
        isbn = isbn_ean.strip()

    if not isbn:
        isbn = None

    return isbn, ean