def test_empty_sheet(self):
s = FormattableSheet([])
ret = s.cell_value(100, 100)
assert ret is None
ret = s._cell_value(100, 100)
assert ret == ""
def test_empty_sheet(self):
s = FormattableSheet([])
ret = s.cell_value(100, 100)
assert ret is None
ret = s._cell_value(100, 100)
assert ret == ""
