code: def test_table_nones(self):
      none_data = [{"a": 1, "b": None}, {"a": None, "b": 2}]
      tbl = Table(none_data)
      assert tbl.size() == 2
      assert tbl.schema() == {"a": int, "b": int}
  
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 12 for calling the TestTable obj's underlying member method code with example usage: obj.test_table_nones() without return types