Update app.py

app.py

@@ -125,7 +125,6 @@ file_path=""
 num_responses=0
 current_chat_mode="STANDARD"
 retriever=None
-index = None
 token_count_bandi=0
 token_count_bandi_sistema_puglia=0
 chat_engine_bandi=None
@@ -176,7 +175,6 @@ def main():
     def select_collection(evt: gr.SelectData):
         global current_collection
         global retriever
-        global index
         global chat_engine_bandi
         global chat_engine_bandi_sistema_puglia
         global token_count_bandi