code: def test_merge_None_to_dict():
      assert dask.config.merge(
          {"a": None, "c": 0}, {"a": {"b": 1}}
      ) == {
          "a": {"b": 1},
          "c": 0,
      }
  
imports: from __future__ import annotations
  import os
  import site
  import stat
  import sys
  from collections import OrderedDict
  from contextlib import contextmanager
  import pytest
  import yaml
  import dask.config
  from dask.config import _get_paths, canonical_name, collect, collect_env, collect_yaml, config, deserialize, ensure_file, expand_environment_variables, get, merge, pop, refresh, rename, serialize, update, update_defaults
  from dask.utils import tmpfile
label_desc: Use image node_id 32 for calling a global function with example usage: test_merge_None_to_dict() without return types