message: Open output file only if saving trees
diff: @@ -396,8 +396,8 @@ void AliAnalysisTaskNucleiYield::UserCreateOutputObjects() {
  AliPDG::AddParticlesToPdgDataBase();
  PostData(1,fList);
  - OpenFile(1);
  if (fSaveTrees) {
  + OpenFile(1);
  fRTree = new TTree("RTree", "Reconstructed nuclei");
  fRTree->Branch("RLightNucleus", &fRecNucleus);
  PostData(2, fRTree);
  