Edits a poll.

def edit_poll(args):
    """Edits a poll."""
    if not args.isadmin:
        return "Nope, not gonna do it."
    msg = args.msg.split(maxsplit=1)
    if len(msg) < 2:
        return "Syntax: !vote edit <pollnum> <question>"
    if not msg[0].isdigit():
        return "Not A Valid Positive Integer."
    pid = int(msg[0])
    poll = get_open_poll(args.session, pid)
    if poll is None:
        return "That poll was deleted or does not exist!"
    poll.question = msg[1]
    return "Poll updated!"