Fix error when debug enabled but no port chosen

When the debug level for the device includes SSL but the debug port is
chosen as "None," don't attempt to write debug messages.

Fixes esp8266#7638

Author: earlephilhower

libraries/ESP8266WiFi/src/CertStoreBearSSL.cpp

@@ -21,7 +21,7 @@
 #include <memory>
 
 
-#ifdef DEBUG_ESP_SSL
+#if defined(DEBUG_ESP_SSL) && defined(DEBUG_ESP_PORT)
 #define DEBUG_BSSL(fmt, ...)  DEBUG_ESP_PORT.printf_P((PGM_P)PSTR( "BSSL:" fmt), ## __VA_ARGS__)
 #else
 #define DEBUG_BSSL(...)

libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp

@@ -59,7 +59,7 @@ extern "C" {
 
 #endif
 
-#ifdef DEBUG_ESP_SSL
+#if defined(DEBUG_ESP_SSL) && defined(DEBUG_ESP_PORT)
 #define DEBUG_BSSL(fmt, ...)  DEBUG_ESP_PORT.printf_P((PGM_P)PSTR( "BSSL:" fmt), ## __VA_ARGS__)
 #else
 #define DEBUG_BSSL(...)
@@ -664,7 +664,7 @@ extern "C" {
     if (!xc->done_cert) {
       br_sha1_update(&xc->sha1_cert, buf, len);
       br_x509_decoder_push(&xc->ctx, (const void*)buf, len);
-#ifdef DEBUG_ESP_SSL
+#if defined(DEBUG_ESP_SSL) && defined(DEBUG_ESP_PORT)
       DEBUG_BSSL("CERT: ");
       for (size_t i=0; i<len; i++) {
         DEBUG_ESP_PORT.printf_P(PSTR("%02x "), buf[i] & 0xff);