de-shit-itself-ination 1

app.py

@@ -130,10 +130,11 @@ def import_chat(custom_format_string):
 
 def export_chat(history, system_prompt):
     export_data = f"<|system|> {system_prompt}\n\n"
-    for user_msg, assistant_msg in history:
-        export_data += f"<|user|> {user_msg}\n\n"
-        if assistant_msg:
-            export_data += f"<|assistant|> {assistant_msg}\n\n"
+    if history is not None:
+        for user_msg, assistant_msg in history:
+            export_data += f"<|user|> {user_msg}\n\n"
+            if assistant_msg:
+                export_data += f"<|assistant|> {assistant_msg}\n\n"
     return export_data
 
 def stop_generation_func():
@@ -189,13 +190,13 @@ with gr.Blocks(theme='gradio/monochrome') as demo:
         stop_generation.clear()
 
     def regenerate_response(history, system_prompt, temperature, top_p, top_k, frequency_penalty, presence_penalty, repetition_penalty, max_tokens):
-        if history is not None and len(history) > 0:
+        if history and len(history) > 0:
             last_user_message = history[-1][0]
             history[-1][1] = None  
             for new_history in bot(history, system_prompt, temperature, top_p, top_k, frequency_penalty, presence_penalty, repetition_penalty, max_tokens):
                 yield new_history
         else:
-            yield [] if history is None else history
+            yield []
 
     def import_chat_wrapper(custom_format_string):
         imported_history, imported_system_prompt = import_chat(custom_format_string)