message: Don't dereference something that by construction is NULL
diff: @@ -479,10 +479,15 @@ void AliPerformanceMatch::FillHistograms(AliVTrack *const refParamVTrack, AliVTr
  if(!refParamVTrack || !paramVTrack || !isRec) return;
  - AliExternalTrackParam *refParam = NULL;
  - AliExternalTrackParam *param = NULL;
  - refParam->CopyFromVTrack(refParamVTrack);
  - param->CopyFromVTrack(paramVTrack);
  +
  + //this should be done with a copy ctor?
  + AliExternalTrackParam refParam_;
  + AliExternalTrackParam param_;
  + refParam_.CopyFromVTrack(refParamVTrack);
  + param_.CopyFromVTrack(paramVTrack);
  +
  + AliExternalTrackParam *refParam = &refParam_;
  + AliExternalTrackParam *param = &param_;
  if(!refParam) return;
  if(!param) return;
  