ticket:10070: And handle NULl return from uregion_getContainedRegions... while I am at it

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33522 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10070: Misunderstanding, back out r33521

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33524 251d0590-4201-4cf1-90de-194747b24ca1