code: def test_min_max_empty(self, skipna):
      arr = period_array([], freq="D")
      result = arr.min(skipna=skipna)
      assert result is pd.NaT
  
      result = arr.max(skipna=skipna)
      assert result is pd.NaT
  
imports: import pandas
  from pandas.core.arrays import period_array
label_desc: Use image node_id 2 for calling the TestReductions obj's underlying member method code with example usage: obj.test_min_max_empty(skipna) without return types