Wrongly set basic-auth when username and password are both empty

Our couchbase cluster/bucket do not require credentials for managing, thus when creating a bucket manager, the username and password are both set to empty string.
But in the Golang SDK (https://github.com/couchbase/gocb/blob/4d157c9c3b4ec7db3d73153a79082025c1a53618/bucketmgr.go#L68) there is a statement to set using basic auth even when the username and password are empty.
This causes the CB server to actively checking for auth, and then returns 401 because the password is empty.
We would like to request a change to the linked statement to check for username and password before setting the value, so when both are empty, that statement can skip execution.