code: def _calculate_panel_spacing_facet_null(
      pack: LayoutPack, spaces: LRTBSpaces
  ) -> WHSpaceParts:
      """
      Calculate spacing parts for facet_null
      """
      _property = pack.theme.themeables.property
      W, H = pack.theme.themeables.property("figure_size")
      w = spaces.right - spaces.left
      h = spaces.top - spaces.bottom
      return WHSpaceParts(W, H, w, h, 0, 0, 0, 0)
  
imports: from __future__ import annotations
  import typing
  from abc import ABC
  from dataclasses import dataclass, fields
  from itertools import chain
  from matplotlib._tight_layout import get_subplotspec_list
  from ..facets import facet_grid, facet_null, facet_wrap
  from .patches import SFancyBboxPatch
  from .utils import bbox_in_figure_space, tight_bbox_in_figure_space
label_desc: Use image node_id 4 for calling a global function with example usage: _calculate_panel_spacing_facet_null(pack, spaces) and returns: WHSpaceParts