Get <tr> tag with given `ID` and return content of the last <td> tag from
    <tr> root.

    Args:
        details (obj): :class:`dhtmlparser.HTMLElement` instance.
        ID (str): id property of the <tr> tag.

    Returns:
        str: Content of the last <td> as strign.

def _get_td_or_none(details, ID):
    """
    Get <tr> tag with given `ID` and return content of the last <td> tag from
    <tr> root.

    Args:
        details (obj): :class:`dhtmlparser.HTMLElement` instance.
        ID (str): id property of the <tr> tag.

    Returns:
        str: Content of the last <td> as strign.
    """
    content = details.find("tr", {"id": ID})
    content = _get_last_td(content)

    # if content is None, return it
    if not content:
        return None

    content = content.getContent().strip()

    # if content is blank string, return None
    if not content:
        return None

    return content