fix NodalLCOperator.__init__() for multivariate polynomials
fix NodalLCOperator.__init__() for multivariate polynomials

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