code: def test_read_params_nonexistent_file(dvc):
      dep = ParamsDependency(Stage(dvc), None, ["foo"])
      assert dep.read_params() == {}
  
imports: import pytest
  from dvc.dependency import ParamsDependency, loadd_from, loads_params
  from dvc.dependency.param import BadParamFileError, MissingParamsError
  from dvc.stage import Stage
  from dvc.utils.serialize import dump_toml, dump_yaml, load_yaml
label_desc: Use image node_id 7 for calling a global function with example usage: test_read_params_nonexistent_file(dvc) without return types