fixed error reporting. Within transactions, after an error the users should rollback!
fixed error reporting. Within transactions, after an error the users should
rollback!

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb