Fix: Todo Multi refresh ...

fix some promises problem

src/root/home/home.ts

@@ -59,7 +59,8 @@ export default class Home extends Vue {
     window.addEventListener('beforeinstallprompt', function (event) {
       // console.log('********************************   beforeinstallprompt fired')
       event.preventDefault()
-      console.log('§§§§§§§§§§§§§§§§§§§§  IMPOSTA DEFERRED PROMPT  !!!!!!!!!!!!!!!!!  ')
+      // console.log('§§§§§§§§§§§§§§§§§§§§  IMPOSTA DEFERRED PROMPT  !!!!!!!!!!!!!!!!!  ')
+      // #Todo++ IMPOSTA DEFERRED PROMPT
       return false
     })
 
@@ -69,6 +70,10 @@ export default class Home extends Vue {
     return Notification.permission
   }
 
+  NotServiceWorker () {
+    return (!('serviceWorker' in navigator))
+  }
+
   displayConfirmNotification() {
     let options = null
     if ('serviceWorker' in navigator) {
@@ -88,10 +93,12 @@ export default class Home extends Vue {
         ]
       }
 
-      navigator.serviceWorker.ready
-        .then(function (swreg) {
-          swreg.showNotification('Successfully subscribed!', options)
-        })
+      if ('serviceWorker' in navigator) {
+        navigator.serviceWorker.ready
+          .then(function (swreg) {
+            swreg.showNotification('Successfully subscribed!', options)
+          })
+      }
     }
   }
 
@@ -168,7 +175,6 @@ export default class Home extends Vue {
   }
 
 
-
   test_fetch() {
     fetch('https:/httpbin.org/post', {
       method: 'POST',