message: Fix Phi-Pt histogram in MC
diff: @@ -513,7 +513,8 @@ void AliAnalysisTaskNucleiYield::UserExec(Option_t *){
  }
  if (!acceptedTrack) continue;
  - fHist2Phi[track->GetSign() > 0]->Fill(track->Phi() , track->Pt() );
  + bool positive = track->GetSign() > 0;
  + if (fHist2Phi[positive]) fHist2Phi[positive]->Fill(track->Phi() , track->Pt() );
  const int iTof = beta > EPS ? 1 : 0;
  float pT = track->Pt() * fCharge;
  