Fix CW issues in static view on Safari (Fixes #8354) (#8446)

* Fix CW issues in static view on Safari (8354)

* Fixed formatting issues

* Trailing space

app/javascript/packs/public.js

@@ -79,7 +79,10 @@ function main() {
         .catch(error => console.error(error));
     }
 
-    new Rellax('.parallax', { speed: -1 });
+    const parallaxComponents = document.querySelectorAll('.parallax');
+    if (parallaxComponents.length > 0 ) {
+      new Rellax('.parallax', { speed: -1 });
+    }
 
     const history = createHistory();
     const detailedStatuses = document.querySelectorAll('.public-layout .detailed-status');