code: def test_metrics_show_no_metrics_found(tmp_dir, dvc):
      # Empty repo
      assert api.metrics_show() == {}
  
      # dvc.yaml but no metrics
      dvc.stage.add(name="echo", cmd="echo foo")
      assert api.metrics_show() == {}
  
imports: import json
  import os
  from textwrap import dedent
  from typing import Dict, List
  import pytest
  from dvc import api
label_desc: Use image node_id 16 for calling a global function with example usage: test_metrics_show_no_metrics_found(tmp_dir, dvc) without return types