code: def test_table_index_datetime_with_none(self):
      tbl = Table(
          {
              "a": [
                  datetime(2019, 7, 11, 15, 30),
                  None,
                  datetime(2019, 7, 11, 12, 10),
                  datetime(2019, 7, 11, 5, 0),
              ],
              "b": [4, 3, 2, 1],
          },
          index="a",
      )
      assert tbl.view().to_dict() == {
          "a": [
              None,
              datetime(2019, 7, 11, 5, 0),
              datetime(2019, 7, 11, 12, 10),
              datetime(2019, 7, 11, 15, 30),
          ],
          "b": [3, 1, 2, 4],
      }
  
imports: import sys
  from datetime import date, datetime
  from perspective.core.exception import PerspectiveError
  from perspective.table import Table
  from perspective.table._state import _PerspectiveStateManager
  from perspective.table.libpsppy import PerspectiveCppError, t_filter_op
  from pytest import raises
label_desc: Use image node_id 47 for calling the TestTable obj's underlying member method code with example usage: obj.test_table_index_datetime_with_none() without return types