mclient: don't substitute NULL by language
mclient: don't substitute NULL by language

Add missing break such that nullstring isn't overridden when -T is used.

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