Wait to log in before starting background tasks (#234)

src/worker.rs

@@ -1217,6 +1217,10 @@ impl ClientWorker {
             let settings = self.settings.clone();
 
             async move {
+                while !client.logged_in() {
+                    tokio::time::sleep(Duration::from_millis(100)).await;
+                }
+
                 let load = load_older_forever(&client, &store);
                 let rcpt = send_receipts_forever(&client, &store);
                 let room = refresh_rooms_forever(&client, &store);