Update app.py

app.py

@@ -16,8 +16,10 @@ pipeline = PIPELINE(model, "rwkv_vocab_v20230424")
 def generate_prompt(instruction, input=None, history=None):
     # parse the chat history into a string of user and assistant messages
     history_str = ""
-    for pair in history:
-        history_str += f"Instruction: {pair[0]}\n\nAssistant: {pair[1]}\n\n"
+
+    if history is not None:
+        for pair in history:
+            history_str += f"Instruction: {pair[0]}\n\nAssistant: {pair[1]}\n\n"
 
     instruction = instruction.strip().replace('\r\n','\n').replace('\n\n','\n').replace('\n\n','\n')
     input = input.strip().replace('\r\n','\n').replace('\n\n','\n').replace('\n\n','\n')