if we call mongo_cursor_next() for the first time and there is no result, we should return MONGO_CURSOR_EXHAUSTED
if we call mongo_cursor_next() for the first time and there is no result, we should return MONGO_CURSOR_EXHAUSTED

mongodb/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy