// loop over sub checkers
// if recursive, recursively return the pointers of non subchecker type sub checkers
//
- if (!fArrSubCheckers && !fArrSubCheckers->GetEntries()) return 0;
+ if (!fArrSubCheckers || !fArrSubCheckers->GetEntries()) return 0;
if (!fIterSubCheckers) fIterSubCheckers=fArrSubCheckers->MakeIterator();
AliTPCCalibQAChecker *al=(AliTPCCalibQAChecker*)fIterSubCheckers->Next();
if (!al){