Clean code

app.py

@@ -143,7 +143,7 @@ def index_repo(textbox: str, dropdown: str) -> Response:
         print(db)
         print(db.vectorstore.dataset)
         print(len(db.vectorstore.dataset))
-        if db is None or len(db.ds) == 0:
+        if db is None or len(db.vectorstore.dataset) == 0:
             print("Dataset doesn't exist, fetching data")
             try:
                 docs = []