code: def test_empty(self):
      doc = whitespace_nlp("")
      term_freq = FeatsFromSpacyDoc().get_feats(doc)
      self.assertEqual(Counter(), term_freq)
  
imports: import re
  from collections import Counter
  from unittest import TestCase
  from scattertext import whitespace_nlp
  from scattertext.WhitespaceNLP import Tok, Doc, _regex_parse_sentence, whitespace_nlp_with_sentences
  from scattertext.features.FeatsFromSpacyDoc import FeatsFromSpacyDoc
  from scattertext.features.FeatsFromSpacyDocOnlyNounChunks import FeatsFromSpacyDocOnlyNounChunks
label_desc: Use image node_id 5 for calling the TestFeatsFromSpacyDoc obj's underlying member method code with example usage: obj.test_empty() without return types