code: def test_empty_dict_config_updates(ex):
      @ex.config
      def cfg():
          a = 1
  
      @ex.config
      def default():
          a = {"b": 1}
  
      @ex.main
      def main():
          pass
  
      r = ex.run()
      assert r.config["a"]["b"] == 1
  
imports: from sacred import Ingredient
  from mock import patch
  import pytest
  import sys
  from sacred import cli_option
  from sacred import host_info_gatherer
  from sacred.experiment import Experiment
  from sacred.utils import apply_backspaces_and_linefeeds, ConfigAddedError, SacredError
label_desc: Use image node_id 12 for calling a global function with example usage: test_empty_dict_config_updates(ex) without return types