Crash if FixedConstraint is not present

[epernod]

[ERROR] [InterventionalRadiologyController(DeployController)] No fixedConstraint found.

########## SIG 11 - SIGSEGV: segfault ##########
sofa::helper::BackTrace::dump
sofa::helper::BackTrace::sig
seh_filter_exe
seh_filter_exe
_C_specific_handler
_chkstk
RtlRaiseException
KiUserExceptionDispatcher
sofa::component::constraint::projective::ProjectToLineConstraint<sofa::defaulttype::StdVectorTypes<sofa::type::Vec<2,double>,sofa::type::Vec<2,double>,double> >::clearConstraints
sofa::component::controller::interventionalradiologycontroller::InterventionalRadiologyController<sofa::defaulttype::StdRigidTypes<3,double> >::fixFirstNodesWithUntil