"len() of unsized object" exception when trying to display "scalar" Group #313

>>> la.Axis('age=0..3')[2]

Traceback (most recent call last):
  File "C:\usr\devel\larray-editor\larray_editor\editor.py", line 1044, in ipython_cell_executed
  File "C:\usr\devel\larray-editor\larray_editor\editor.py", line 887, in select_list_item
    self.set_current_array(self.data[to_display], to_display)
  File "C:\usr\devel\larray-editor\larray_editor\editor.py", line 1131, in set_current_array
    # FIXME: we should never store the current_array but current_adapter instead
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\usr\devel\larray-editor\larray_editor\arraywidget.py", line 1888, in set_data
    self.set_data_adapter(data_adapter, frac_digits)
  File "C:\usr\devel\larray-editor\larray_editor\arraywidget.py", line 1914, in set_data_adapter
    self._set_models_adapter()
  File "C:\usr\devel\larray-editor\larray_editor\arraywidget.py", line 1872, in _set_models_adapter
    self.model_axes.set_adapter(self.data_adapter)
  File "C:\usr\devel\larray-editor\larray_editor\arraymodel.py", line 211, in set_adapter
    self._get_current_data()
  File "C:\usr\devel\larray-editor\larray_editor\arraymodel.py", line 494, in _get_current_data
    max_row, max_col = self.adapter.shape2d()
                       ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\usr\devel\larray-editor\larray_editor\arrayadapter.py", line 1276, in shape2d
    return len(self.data), 1
           ^^^^^^^^^^^^^^
  File "C:\usr\devel\larray\larray\core\group.py", line 896, in __len__
    raise TypeError(f'len() of unsized object ({value})')
TypeError: len() of unsized object (2)