fix 1D case in LegendreSimplexPolySpace._combine_polyvals()
fix 1D case in LegendreSimplexPolySpace._combine_polyvals()

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