SNI & Subject.DN Question

Why not signal the need to check subject.dn based on the absence of your SNI info?

Pseudocode:

when CLIENT_DATA {
    set check_subject_dn 0
    if { [SNI existence check goes here]}
        [extract SNI and do whatever]
    } else {
        set check_subject_dn 1
    }
}
when SERVERSSL_SERVERCERT {
    if { ([SSL::cert count] != 0) && $check_subject_dn }{
        set cert [SSL::cert 0]
        set subject_dn [findstr [X509::subject [SSL::cert 0]] "CN=" 3 ","]
        log "gn_proxy: Server Certificate Received: $subject_dn [IP::server_addr]"
}
}