update FieldVariable.set_from_other() for no CloseNodesIterator
update FieldVariable.set_from_other() for no CloseNodesIterator

sfepy/sfepy,vlukes/sfepy,rc/sfepy,vlukes/sfepy,vlukes/sfepy,BubuLK/sfepy,rc/sfepy,sfepy/sfepy,BubuLK/sfepy,rc/sfepy,BubuLK/sfepy,sfepy/sfepy