code: def _early_exit(filenames, reader):
      if not filenames and not reader:
          # used for an empty Scene
          return True
      if reader and filenames is not None and not filenames:
          # user made a mistake in their glob pattern
          raise ValueError("'filenames' was provided but is empty.")
      if not filenames:
          LOG.warning(
              "'filenames' required to create readers and load data"
          )
          return True
      return False
  
imports: from __future__ import annotations
  import logging
  import os
  import pathlib
  import pickle
  import warnings
  from datetime import datetime, timedelta
  from functools import total_ordering
  import yaml
  from yaml import UnsafeLoader
  from satpy._config import config_search_paths, get_entry_points_config_dirs, glob_config
  from .yaml_reader import AbstractYAMLReader
  from .yaml_reader import load_yaml_configs
label_desc: Use image node_id 15 for calling a global function with example usage: _early_exit(filenames, reader) and returns: False, True, True