Update visualizer_app.py

visualizer_app.py

@@ -871,7 +871,7 @@ def chunks_to_process(
     document_range_stack,
     get_data_in_range_triplequote,
 ):
-    if dict_from_nodes is not None and document_range_stack.value is not None:
+    if dict_from_nodes is not None and document_range_stack is not None:
 
         chunk_dict_df = create_cumulative_dataframe(dict_from_nodes)