chore(Notification): minor optimizations

src/common/notification.js

@@ -17,8 +17,17 @@ export class Notification extends Component {
     instance = this
   }
 
+  // This special component never have to rerender!
+  shouldComponentUpdate () {
+    return false
+  }
+
   render () {
     return <ReactNotify ref={notification => {
+      if (!notification) {
+        return
+      }
+
       error = (title, body) => notification.error(title, body, 3e3)
       info = (title, body) => notification.info(title, body, 3e3)
       success = (title, body) => notification.success(title, body, 3e3)