Bug 691574 - (cov#10577) Check return types when adding RDN CSNs
    
    We are not checking the return types when searching for RDN attrs
    and values to create the RDN CSNs.  This could result in us using
    a deleted attribute or value when we should only be looking at
    present attributes and values.  Checking the return type allows
    us to verify that we found a present attribute or value.