Update app.py

app.py

@@ -64,7 +64,7 @@ pipeline = PIPELINE(model, "rwkv_vocab_v20230424")
 
 #Assistant:"""
 
-def generate_prompt(instruction, input=None):
+def generate_prompt(instruction, input=""):
     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')
     if input: