message: fixed seg. fault due to null cluster
diff: @@ -2209,7 +2209,10 @@ void AliAnalysisTaskCaloHFEpp::IsolationTrackBase(Int_t itrack, AliVTrack *track
  AliVCluster *Assoclust_TrCone = 0x0;
  Assoclust_TrCone = dynamic_cast<AliVCluster*>(fCaloClusters_tender->At(EMCalIndex_TrCone));
  + if(Assoclust_TrCone)
  + {
  risoTrack += Assoclust_TrCone->E();
  + }
  //cout << "risoTrack = " << risoTrack << endl;
  NtrackCone++;
  