was: SortedBag iterator problems
During investigation of Cldrbug:7988, I found instances where com.ibm.icu.dev.util.SortedBag's iterator returns true for hasNext(), but then the next() returns a null. This should never happen. Needs some investigation to figure out why. I was able to dodge the problem in CLDR's tooling by just eating the exception, but this isn't really a clean solution.