code: def test_empty_dataset(self):
      with pytest.raises(AttributeError):
          train_test_split([])
  
imports: import pytest
  from darts.utils.model_selection import MODEL_AWARE, SIMPLE, train_test_split
  from darts.utils.timeseries_generation import constant_timeseries
label_desc: Use image node_id 4 for calling the TestClassTrainTestSplit obj's underlying member method code with example usage: obj.test_empty_dataset() without return types