sql.py: mk_select(): Fixed bug where order_by needed to default to None if distinct_on was used. Fixed bug where cond values were being treated as %s params in addition to being parsed by sql_gen.as_ValueCond().to_str().
sql.py: mk_select(): Fixed bug where order_by needed to default to None if distinct_on was used. Fixed bug where cond values were being treated as %s params in addition to being parsed by sql_gen.as_ValueCond().to_str().