check for nans
check for nans

olivierverdier/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,rc/sfepy,lokik/sfepy,sfepy/sfepy,lokik/sfepy,rc/sfepy,BubuLK/sfepy,sfepy/sfepy,RexFuzzle/sfepy,vlukes/sfepy,vlukes/sfepy,RexFuzzle/sfepy,rc/sfepy,lokik/sfepy,vlukes/sfepy,BubuLK/sfepy,lokik/sfepy,sfepy/sfepy,olivierverdier/sfepy,olivierverdier/sfepy,RexFuzzle/sfepy