Remove unnecessary variable in NovintScaffold::calculateForceAndTorque.
Remove unnecessary variable in NovintScaffold::calculateForceAndTorque.

info->force is setZero before calculateForceAndTorque is called,
so if the vectors().get() fails the (nominal) force will be zero
which is a reasonable value.

simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim