code: def empty_input(self, aug):
      text = ""
  
      augmented_data = aug.augment(text)
      self.assertTrue(len(augmented_data) == 0)
  
file_path: nlpaug/test/augmenter/sentence/test_context_word_embs_sentence.py
imports: import unittest
  import os
  import torch
  from dotenv import load_dotenv
  import nlpaug.augmenter.sentence
label_desc: Use image node_id 7 for calling the TestContextualWordEmbsAug obj's underlying member method code with example usage: obj.empty_input(aug) without return types