message: protection against not found mc label
diff: @@ -1490,7 +1490,8 @@ void AliAnaChargedParticles::MakeAnalysisFillHistograms()
  if ( label >= 0 )
  {
  AliVParticle * mom = GetMC()->GetTrack(label);
  - mompdg =TMath::Abs(mom->PdgCode());
  + if ( mom ) mompdg =TMath::Abs(mom->PdgCode());
  + else AliInfo(Form("Mother particle for label %d not found",label));
  }
  Int_t mcType = kmcUnknown;
  