Don't attempt session resumption if no ticket is present and session

ID length is zero.

ssl/s3_clnt.c

@@ -618,9 +618,15 @@ int ssl3_client_hello(SSL *s)
 	buf=(unsigned char *)s->init_buf->data;
 	if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 		{
-		if ((s->session == NULL) ||
-			(s->session->ssl_version != s->version) ||
-			(s->session->not_resumable))
+		SSL_SESSION *sess = s->session;
+		if ((sess == NULL) ||
+			(sess->ssl_version != s->version) ||
+#ifdef OPENSSL_NO_TLSEXT
+			!sess->session_id_length ||
+#else
+			(!sess->session_id_length && !sess->tlsext_tick) ||
+#endif
+			(sess->not_resumable))
 			{
 			if (!ssl_get_new_session(s,0))
 				goto err;