fix: bug

app.py

@@ -17,7 +17,7 @@ default_threshold = 0.5
 
 def search_documents(input_text, courseOfStudy, index, k = default_k, fetch_k = default_fetch_k, score_threshold = default_threshold):
     if not input_text:
-        return []
+        return [[], []]  # Return empty outputs for both components
     
     metadata = {}
     if courseOfStudy:
@@ -33,7 +33,7 @@ def search_documents(input_text, courseOfStudy, index, k = default_k, fetch_k =
             )
     except Exception as e:
         print(f"Error during search: {e}")
-        return []
+        return [[], []]  # Return empty outputs for both components if an error occurs
     
     rows = [
         [