message: Fix unimplemented method issue.
diff: @@ -18,7 +18,10 @@ public:
  if (fIndex >= 0)
  head->SetVar(fIndex, AliMultSelectionTask::IsINELgtZERO(event) ? 1 : 0);
  }
  - virtual void SetNanoAODTrack (const AliAODTrack * aodTrack, AliNanoAODTrack * spTrack) =0;
  + virtual void SetNanoAODTrack (const AliAODTrack * aodTrack, AliNanoAODTrack * spTrack) {
  + // This function will not be used in this class.
  + return;
  + };
  protected:
  bool fGoodToGo;
  