fix regression in ExpressionBuilder.apply_layout() from 0f8bc58
fix regression in ExpressionBuilder.apply_layout() from 0f8bc58

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