Issue #3443527 by godotislate, smustgrave: Setting empty URL when making embedded media a link in CKEditor5 causes JS errors

(cherry picked from commit 74f01afaa1)

core/modules/ckeditor5/js/ckeditor5_plugins/drupalMedia/src/drupallinkmedia/drupallinkmediaediting.js

@@ -53,7 +53,7 @@ function upcastMediaLink() {
         const linkHref = viewLink.getAttribute('href');
 
         // Missing the `href` attribute.
-        if (!linkHref) {
+        if (linkHref === null) {
           return;
         }