ticket:10131: Added C test to verify that 3 empty set values stop fallback for ures_getStringByKeyWithFallback

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33749 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10045: Fix again so that zero shows as 0 not 0.0

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk@33751 251d0590-4201-4cf1-90de-194747b24ca1