Counts hunt results of a given hunt using given query options.

def CountHuntResults(self,
                       hunt_id,
                       with_tag=None,
                       with_type=None,
                       cursor=None):
    """Counts hunt results of a given hunt using given query options."""
    hunt_id_int = db_utils.HuntIDToInt(hunt_id)

    query = "SELECT COUNT(*) FROM flow_results WHERE hunt_id = %s "

    args = [hunt_id_int]

    if with_tag is not None:
      query += "AND tag = %s "
      args.append(with_tag)

    if with_type is not None:
      query += "AND type = %s "
      args.append(with_type)

    cursor.execute(query, args)
    return cursor.fetchone()[0]