code: def test_merge_one_none():
      component = MergeLoop(expected_type=int, inputs=[])
      results = component.run()
      assert results == {}
  
file_path: haystack/test/core/sample_components/test_merge_loop.py
imports: from typing import Dict
  import pytest
  from haystack.core.errors import DeserializationError
  from haystack.testing.sample_components import MergeLoop
label_desc: Use image node_id 13 for calling a global function with example usage: test_merge_one_none() without return types