bson_iterator_string : return empty string if none of the "string-types" applies
bson_iterator_string : return empty string if none of the "string-types" applies
mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,HeliumProject/mongo-c,HeliumProject/mongo-c,HeliumProject/mongo-c,HeliumProject/mongo-c,Elastica/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy