message: Improve protection for division by 0
diff: @@ -1540,7 +1540,7 @@ TGraphAsymmErrors* AliMTRChEffAnalysis::GetOutliers ( TGraphAsymmErrors* graph,
  graph->GetPoint(ipt,xpt,ypt);
  Double_t diff = ypt - func->Eval(xpt);
  Double_t err = ( diff > 0. ) ? graph->GetErrorYlow(ipt) : graph->GetErrorYhigh(ipt);
  - if ( err < 0. || TMath::Abs(diff)/err > maxNsigmas ) continue;
  + if ( err <= 0. || TMath::Abs(diff)/err > maxNsigmas ) continue;
  outliers->RemovePoint(ipt-nremoved);
  nremoved++;
  // outliers->SetPoint(iopt,xpt,ypt);
  