publisher-uaproxy-banner: no TypeError when /status fails, the bar says uaproxyd is not running

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scripts/publisher-uaproxy-banner/publisher-uaproxy-banner.user.js

@@ -85,7 +85,7 @@
 
   function render(s) {
     var state = s && s.state;
-    if (state === 'up' || (s.on_ua && state === 'down')) { hide(); return; }
+    if (state === 'up' || (s && s.on_ua && state === 'down')) { hide(); return; }
     if (!bar) build();
     var base = 'UA proxy down: this page loaded without UA access, so a Zotero save gets no PDF.';
     if (!s) {