code: def test_should_fit_and_parse_empty_intent(self):
      # Given
      dataset = {
          "intents": {
              "dummy_intent": {
                  "utterances": [{"data": [{"text": " "}]}]
              }
          },
          "language": "en",
          "entities": dict(),
      }
  
      slot_filler = CRFSlotFiller(**self.get_shared_data(dataset))
  
      # When
      slot_filler.fit(dataset, "dummy_intent")
      slot_filler.get_slots("ya")
  
imports: from __future__ import unicode_literals
  import io
  import os
  from builtins import range
  from pathlib import Path
  from unittest import skipIf
  from mock import MagicMock, PropertyMock
  from sklearn_crfsuite import CRF
  from snips_nlu.constants import DATA, END, ENTITY, LANGUAGE_EN, SLOT_NAME, START, TEXT, RANDOM_STATE
  from snips_nlu.dataset import Dataset
  from snips_nlu.entity_parser import CustomEntityParserUsage
  from snips_nlu.exceptions import NotTrained
  from snips_nlu.pipeline.configs import CRFSlotFillerConfig
  from snips_nlu.preprocessing import tokenize, Token
  from snips_nlu.result import unresolved_slot
  from snips_nlu.slot_filler.crf_slot_filler import CRFSlotFiller, _ensure_safe, _encode_tag, CRF_MODEL_FILENAME
  from snips_nlu.slot_filler.crf_utils import TaggingScheme
  from snips_nlu.slot_filler.feature_factory import IsDigitFactory, NgramFactory, ShapeNgramFactory
  from snips_nlu.tests.utils import FixtureTest, TEST_PATH
label_desc: Use image node_id 22 for calling the TestCRFSlotFiller obj's underlying member method code with example usage: obj.test_should_fit_and_parse_empty_intent() without return types