create URL fallback only when necessary

js/toolbox.js

@@ -290,9 +290,11 @@ function tryJSONparse(jsonString) {
   } catch (e) {}
 }
 
-function tryURL(
+function tryURL(url) {
-  url,
+  try {
-  fallback = {
+    return new URL(url);
+  } catch (e) {
+    return {
       hash: '',
       host: '',
       hostname: '',
@@ -305,11 +307,7 @@ function tryURL(
       search: '',
       searchParams: new URLSearchParams(),
       username: '',
-  }) {
+    };
-  try {
-    return new URL(url);
-  } catch (e) {
-    return fallback;
   }
 }