message: fix for bug when run number is stored with index==0
diff: @@ -111,7 +111,7 @@ Double_t AliNanoAODHeader::GetCentr (const char *x) const {
  }
  Int_t AliNanoAODHeader::GetRunNumber() const {
  - if (fRunNumber>0) return GetVarInt(fRunNumber);
  + if (fRunNumber>-1) return GetVarInt(fRunNumber);
  return 0;
  }
  