crypto/tls: reject TLS 1.3 empty NewSessionTicket messages

[FiloSottile]

We are currently failing the new SendEmptySessionTicket-TLS13 BoGo test. Harmless but worth fixing.

[gopherbot]

Change https://go.dev/cl/650735 mentions this issue: crypto/tls: reject empty TLS13 session ticket

[gopherbot]

Change https://go.dev/cl/650735 mentions this issue: crypto/tls: reject empty TLS 1.3 session ticket