NCBC-621: Handle uncaught exception if IriParsing is not supported by platform

Change-Id: I5da0bdf2cdc26831d9df2679aad182259ffdd6ec
Reviewed-on: http://review.couchbase.org/41801
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Simon Baslé <simon@couchbase.com>