Update answerer.py

answerer.py

@@ -1,4 +1,4 @@
-from typing import Dict, List
+from typing import Callable, Dict, List
 import os, gc
 from rwkv.model import RWKV
 from rwkv.utils import PIPELINE, PIPELINE_ARGS
@@ -68,7 +68,7 @@ class Answerer:
       if "\ufffd" not in tmp:
         tokens.clear()
         result += tmp
-        if(callback) callback(result)
+        if(callback): callback(result)
 
     tokens.clear()
     occurrences.clear()