Update app.py

app.py

@@ -51,7 +51,7 @@ async def syncMessages():
         for dir in os.listdir("data"):
             i += 1
             with dirs[i]:
-                if files == []:
+                if os.listdir(f"data/{dir}") == []:
                   return 0
                 files = st.tabs(os.listdir("data/" + dir))
                 k = -1