code: def test_categorical_empty(self):
      # GH 1705
  
      def make_empty():
          return pd.DataFrame({"A": pd.Categorical([np.nan, np.nan])})
  
      def make_full():
          return pd.DataFrame({"A": pd.Categorical(["a", "a"])})
  
      a = dd.from_delayed(
          [dask.delayed(make_empty)(), dask.delayed(make_full)()]
      )
      # Used to raise an IndexError
      a.A.cat.categories
  
imports: from __future__ import annotations
  import contextlib
  import operator
  import warnings
  import numpy
  import pandas
  import pytest
  import dask
  import dask.dataframe
  from dask.dataframe import _compat
  from dask.dataframe._compat import PANDAS_GE_150, PANDAS_GE_200, PANDAS_GE_210, tm
  from dask.dataframe._pyarrow import to_pyarrow_string
  from dask.dataframe.core import _concat
  from dask.dataframe.utils import assert_eq, clear_known_categories, get_string_dtype, make_meta, pyarrow_strings_enabled
label_desc: Use image node_id 3 for calling the TestCategoricalAccessor obj's underlying member method code with example usage: obj.test_categorical_empty() and returns: pd, pd