Introduce MaybeError type

src/navigation.rs

@@ -172,7 +172,7 @@ impl ScreenState {
     }
 
     async fn load_web_backup(string: String) -> Result<bool, NotificationData> {
-        let local = get_local_version().await;
+        let local = get_local_version().await?;
         let web = get_web_version(string.as_str()).await?;
         info!("{} {}", local, web);
         if web > local {