tools: set normalizeTD text default to empty string

PR-URL: nodejs#51543
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>

Author: marco-ippolito

tools/dep_updaters/update-root-certs.mjs

@@ -28,7 +28,7 @@ const getCertdataURL = (version) => {
   return certdataURL;
 };
 
-const normalizeTD = (text) => {
+const normalizeTD = (text = '') => {
   // Remove whitespace and any HTML tags.
   return text?.trim().replace(/<.*?>/g, '');
 };