Sherpa: add a check for HepMC3, EvgenJobTransforms: firstEvent>0 check added
Sherpa: add a check for HepMC3 - to avoid potential problems with loading HepMC3 libs for HepMC2 running
EvgenJobTransforms: firstEvent>0 check added
Sherpa: add a check for HepMC3 - to avoid potential problems with loading HepMC3 libs for HepMC2 running
EvgenJobTransforms: firstEvent>0 check added