code: def test_non_existing_prefix_is_treated_as_empty_dict(ex):
      @ex.capture(prefix="nonexisting")
      def transmogrify(b=10):
          return b
  
      @ex.main
      def foo():
          return transmogrify()
  
      assert ex.run().result == 10
  
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 9 for calling a global function with example usage: test_non_existing_prefix_is_treated_as_empty_dict(ex) and returns: b, transmogrify