@property
    def msg(self):
        return '' if self.exc is None else exception_str(self.exc)
Expect a formula card to require a body.
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.main/src/openmdao/main/case.py/Case.msg--crossover with--dataset/ETHPy150Open heiskr/sagefy/server/test/test_models_cards_formula_card.py/test_formula_body