Add safety check when accessing NSLocaleCountryCode.
Add safety check when accessing NSLocaleCountryCode.

Some region formats (like Esperanto) lack a country code and return nil
instead, so they can’t be set as a value in a dictionary.

otaran/FormatterKit,zhou18520786640/FormatterKit,mattt/FormatterKit,sebastianludwig/FormatterKit,gaurav1981/FormatterKit,tevelee/FormatterKit,otaran/FormatterKit,algal/FormatterKit,t089/FormatterKit,boherna/FormatterKit,revolter/FormatterKit,twobitlabs/FormatterKit,twobitlabs/FormatterKit,hodinkee/FormatterKit,iv-mexx/FormatterKit,iMokhles/FormatterKit,colemancda/FormatterKit,BluechipSystems/FormatterKit,Elethom/FormatterKit,otaran/FormatterKit,NghiaTranUIT/FormatterKit,cnbin/FormatterKit,bizz84/FormatterKit,mattt/FormatterKit,mattt/FormatterKit,twobitlabs/FormatterKit,Elethom/FormatterKit,zhaoguohui/FormatterKit