Handle invalid meta refresh URLs in noscript scriptlet

Invalid URLs like "http://" and "http://foo@" trigger TypeErrors
when they are passed to the URL constructor. These TypeErrors
caused the scriptlet to stop processing subsequent noscript nodes
due to uncaught exceptions.

These exceptions are now caught to allow all noscript nodes to
be processed.

src/js/scriptlets/noscript-spoof.js

@@ -42,7 +42,14 @@
         if ( meta === null ) { return; }
         let match = reMetaContent.exec(meta.getAttribute('content'));
         if ( match === null || match[3].trim() === '' ) { return; }
-        let url = new URL(match[3], document.baseURI);
+
+        let url;
+        try {
+            url = new URL(match[3], document.baseURI);
+        } catch(ex) {
+            return;
+        }
+
         if ( reSafeURL.test(url.href) === false ) { return; }
         redirectTimer = setTimeout(( ) => {
                 location.assign(url.href);