message: protection for null pointer
diff: @@ -1187,6 +1187,7 @@ void AliAODEvent::FixCascades(){
  // the on-fly and offline algorithms, the on-fly (first found in the array)
  // was used in the AOD cascade.
  + if (fCascades==0) return;
  Int_t nCasc=GetNumberOfCascades();
  if(nCasc==0) return;
  