correct nontype

app.py

@@ -142,8 +142,11 @@ def stream(input_text) -> Generator:
     while True:
         try:
             next_token = q.get(True, timeout=60)
-            counter = counter + 1
-            print("No data, retry number: ", counter)
+            print("next_token: ", next_token)
+            if len(next_token) ==0:
+                next_token = ""
+            # counter = counter + 1
+            # print("No data, retry number: ", counter)
             if counter > 3:
                 break
             if next_token is job_done: