fix(letsencrypt): check for false as to avoid TypeError

lib/letsencrypt.php

@@ -157,6 +157,9 @@ class LetsEncrypt
     {
         $stream = stream_context_create(array("ssl" => array("capture_peer_cert" => true)));
         $read = stream_socket_client("ssl://" . $domain . ":443", $errno, $errstr, 10, STREAM_CLIENT_CONNECT, $stream);
+        if ($read === false) {
+            return false;
+        }
         $cont = stream_context_get_params($read);
         
         return $cont;