Remove the last content element from this cell if it is an empty
        ``<w:p>`` element.

def _remove_trailing_empty_p(self):
        """
        Remove the last content element from this cell if it is an empty
        ``<w:p>`` element.
        """
        block_items = list(self.iter_block_items())
        last_content_elm = block_items[-1]
        if last_content_elm.tag != qn('w:p'):
            return
        p = last_content_elm
        if len(p.r_lst) > 0:
            return
        self.remove(p)