message: Fix NULL ptr dereferencation
diff: @@ -78,7 +78,10 @@ Bool_t AliHLTOUTDigitReader::ReadNextData(UChar_t*& data)
  while (++fCurrentLink<fNofDDLs) {
  if (fMinDDL>-1 && fMinDDL>fpEquipments[fCurrentLink]) continue;
  if (fMaxDDL>-1 && fMaxDDL<fpEquipments[fCurrentLink]) continue;
  - AliHLTCDHWrapper cdh((void*)fppDigitArrays[fCurrentLink]->GetArray());
  + if (fppDigitArrays[fCurrentLink] == NULL) continue;
  + void* ptr = (void*)fppDigitArrays[fCurrentLink]->GetArray();
  + if (ptr == NULL) continue;
  + AliHLTCDHWrapper cdh(ptr);
  UInt_t headerSize=cdh.GetHeaderSize();
  if (fppDigitArrays[fCurrentLink]->GetSize()>(int)headerSize) {
  data=reinterpret_cast<UChar_t*>(fppDigitArrays[fCurrentLink]->GetArray());
  