code: def find_config(revision):
      
      if not is_git_repo():
          return None
  
      cfg_path = f"{revision}:.cherry_picker.toml"
      cmd = "git", "cat-file", "-t", cfg_path
  
      try:
          output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
          path_type = output.strip().decode("utf-8")
          return cfg_path if path_type == "blob" else None
      except subprocess.CalledProcessError:
          return None
docs: Locate and return the default config for current revison.