code: def test_join_empty_bug(self):
      # generated an exception in 0.4.3
      x = DataFrame()
      x.join(DataFrame([3], index=[0], columns=["A"]), how="outer")
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, DataFrame, Index, MultiIndex, Series, Timestamp, bdate_range, concat, merge, option_context
  import pandas._testing
label_desc: Use image node_id 23 for calling the TestJoin obj's underlying member method code with example usage: obj.test_join_empty_bug() without return types