message: bug fix in AliESDUtils::GetITSPileupVertexInfo
  require at minimum 3 points for EvaluateUni
diff: @@ -374,10 +374,10 @@ void AliESDUtils::GetITSPileupVertexInfo(const AliESDEvent* event, TVectorF& ver
  vertexInfo[4]=LTM;
  vertexInfo[5]=RMS;
  }
  - if (nBufferPileUp>2) {
  + if (nBufferPileUp>3) {
  Int_t nPoints= 0.7*nBufferPileUp;
  - if (nPoints<2) nPoints=2;
  - AliMathBase::EvaluateUni(nBufferPileUp, bufferPrim, LTM,RMS, 0.95*nPoints);
  + if (nPoints<3) nPoints=3;
  + AliMathBase::EvaluateUni(nBufferPileUp, bufferPrim, LTM,RMS, nPoints);
  vertexInfo[6]=LTM;
  vertexInfo[7]=RMS;
  }
  