fix get_pars() in tests/test_functions.py for None in coors argument
fix get_pars() in tests/test_functions.py for None in coors argument

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