Update visualizer_app.py

visualizer_app.py

@@ -591,7 +591,7 @@ def file_loader_input():
 
 @app.cell
 def file_loader_run(file_loader):
-    if file_loader.value is not None:
+    if file_loader.value:
         run_upload_button = mo.ui.run_button(label="Load Files")
     else:
         run_upload_button = mo.ui.run_button(disabled=True, label="Load Files")