Update serviceWorker to the latest from create-react-app

ui/src/serviceWorker.js

@@ -130,8 +130,12 @@ function checkValidServiceWorker(swUrl, config) {
 
 export function unregister() {
   if ('serviceWorker' in navigator) {
-    navigator.serviceWorker.ready.then((registration) => {
-      registration.unregister()
-    })
+    navigator.serviceWorker.ready
+      .then((registration) => {
+        registration.unregister()
+      })
+      .catch((error) => {
+        console.error(error.message)
+      })
   }
 }