code: def test_empty_inputs():
      train_data_frame = TEST_DF_1.copy()
      with pytest.raises(RuntimeError):
          TabularClassificationData.from_data_frame(
              numerical_fields=None,
              categorical_fields=None,
              target_fields="label",
              train_data_frame=train_data_frame,
              num_workers=0,
              batch_size=1,
          )
  
file_path: lightning-flash/tests/tabular/classification/test_data.py
imports: from pathlib import Path
  from unittest.mock import Mock
  import numpy
  import pytest
  from flash.core.data.io.input import DataKeys
  from flash.core.utilities.imports import _TOPIC_TABULAR_AVAILABLE
label_desc: Use image node_id 10 for calling a global function with example usage: test_empty_inputs() without return types