DerivationFrameworkMCTruth: HepMC3 fix

PhysicsAnalysis/DerivationFramework/DerivationFrameworkMCTruth/src/CompactHardTruth.cxx

@@ -1409,7 +1409,11 @@ bool CompactHardTruth::isParton(HepMC::ConstGenParticlePtr p) {
 // It should have been detached from hadronization vertex.
 bool CompactHardTruth::isFinalParton(HepMC::ConstGenParticlePtr p) {
   if (!isParton(p)) return false;
+#ifdef HEPMC3
+  auto endp = p->end_vertex();
+#else
   auto *endp = p->end_vertex();
+#endif
   return endp == nullptr;
 }