fix FieldVariable.setup_initial_conditions() for multiple conditions
fix FieldVariable.setup_initial_conditions() for multiple conditions

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