Since r350 we can't evolve GRHydro without assigning storage for Tmunu. This is far from ideal, since we may want to study only special relativistic effects or to evolve a non-self-gravitating fluid with a live metric. In both cases we don't need storage for Tmunu.
The attached patches fix this problem. It requires to schedule TmunuBase_SetStressEnergyState at Wragh instead of basegrid and before Mol registers any variables.