Rename demo.py to app.py

demo.py → app.py

@@ -30,7 +30,7 @@ def get_data(task, dataset, example):
     _example_path = EXAMPLE_PATH_MAPPING[example]
     csv_file = os.path.join("data", _task_path, _dataset_path, "csv", f"{_example_path}.csv")
     if not os.path.exists(csv_file):
-        return
+        return None
     read_data = pd.read_csv(csv_file)
     data = pd.DataFrame(columns=COLUMN_NAMES)