message: Protections against null pointers to TRD QA histos
diff: @@ -191,22 +191,22 @@ void MakeTrendingPIDQA(const char* inputFile, TString dirInFile = "PIDqa", TStri
  */
  fCanvas->cd(1);
  SetupPadStyle();
  - hLikeP_TRD_3tls_electron->Draw("colz");
  + if(hLikeP_TRD_3tls_electron) hLikeP_TRD_3tls_electron->Draw("colz");
  fCanvas->cd(2);
  SetupPadStyle();
  - hLikeP_TRD_3tls_pion->Draw("colz");
  + if(hLikeP_TRD_3tls_pion) hLikeP_TRD_3tls_pion->Draw("colz");
  fCanvas->cd(3);
  SetupPadStyle();
  - hLikeP_TRD_4tls_electron->Draw("colz");
  + if(hLikeP_TRD_4tls_electron) hLikeP_TRD_4tls_electron->Draw("colz");
  fCanvas->cd(4);
  SetupPadStyle();
  - hLikeP_TRD_4tls_pion->Draw("colz");
  + if(hLikeP_TRD_4tls_pion) hLikeP_TRD_4tls_pion->Draw("colz");
  fCanvas->cd(5);
  SetupPadStyle();
  - hLikeP_TRD_5tls_electron->Draw("colz");
  + if(hLikeP_TRD_5tls_electron) hLikeP_TRD_5tls_electron->Draw("colz");
  fCanvas->cd(6);
  SetupPadStyle();
  - hLikeP_TRD_5tls_pion->Draw("colz");
  + if(hLikeP_TRD_5tls_pion) hLikeP_TRD_5tls_pion->Draw("colz");
  fCanvas->Update();
  fCanvas->Clear();
  