Minor fixes to updateProperties in RigidRepresentationBase
Minor fixes to updateProperties in RigidRepresentationBase

* compare m_rho to 0.0 instead of 0
* don't need to checkt if m_rho is > 0.0 inside block, since it was
  already checked

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