sql.py: DbConn.col_info(): Fixed bug where need to run run_query() recoverably, because this query throws an exception if the column's table does not exist (the information_schema query just returned no rows)
sql.py: DbConn.col_info(): Fixed bug where need to run run_query() recoverably, because this query throws an exception if the column's table does not exist (the information_schema query just returned no rows)