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check_replset_state
returned an empty message in case of mongodb'srs.status()
returned an error object.For example, that was the case when mongod was not running with --replSet or also when the mongod node was not (yet/more) member of a replica set.
Also, instead to map all possible mongodb error messages, it's better to return them directly. This way, you are safe when mongodb introduces new or alters existing error messages in the future.