code: def test_key_val_handler_none():
      ctx = MockContext()
      assert _cb_key_val(ctx, MockOption("profile"), None) == {}
  
imports: import math
  import uuid
  import click
  import pytest
  from rasterio.enums import ColorInterp
  from rasterio.rio.options import bounds_handler, file_in_handler, like_handler, edit_nodata_handler, nodata_handler, _cb_key_val
label_desc: Use image node_id 27 for calling a global function with example usage: test_key_val_handler_none() without return types