code: def _bucket_exists(bucket):
      all_blobs = [blob for blob in bucket.list_blobs()]
      return len(all_blobs) > 0
  
imports: import pytest
  import datetime
  import os
  import json
  from sacred.observers import GoogleCloudStorageObserver
label_desc: Use image node_id 6 for calling a global function with example usage: _bucket_exists(bucket) and returns: unknown