code: def testUpdatePipelineNoPipeline(self):
      # Update pipeline without craeting one.
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_DSL_PATH: self.pipeline_path,
      }
      handler = airflow_handler.AirflowHandler(flags_dict)
      with self.assertRaises(SystemExit) as err:
          handler.update_pipeline()
      self.assertEqual(
          str(err.exception),
          'Pipeline "{}" does not exist.'.format(
              self.pipeline_args[labels.PIPELINE_NAME]
          ),
      )
  
imports: import json
  import os
  import subprocess
  import sys
  from unittest import mock
  import click
  import tensorflow
  from tfx.dsl.components.base import base_driver
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import airflow_handler
  from tfx.utils import io_utils
  from tfx.utils import test_case_utils
label_desc: Use image node_id 6 for calling the AirflowHandlerTest obj's underlying member method code with example usage: obj.testUpdatePipelineNoPipeline() without return types