adding check after utf8string conversion before using it for locale code #1116
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absaroj
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bliptec,
kindbe,
lalitb,
maxgolov,
mkoscumb,
reyang and
sid-dahiya
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In some rare cases, when UTF8String fails the conversions from NSString (due to low memory), it returns NULL, which if passed to std::string(), results in undefined behavior.
Adding null check before the std::string and if null then using "und" as unknown language code (as per iso 639).