message: Fixed a corner case
diff: @@ -231,7 +231,7 @@ def run_tensorflow_pytests_from_artifacts(backend, ngraph_tf_src_dir,
  # Now run the TensorFlow python tests
  test_src_dir = os.path.join(ngraph_tf_src_dir, "test/python/tensorflow")
  test_script = os.path.join(test_src_dir, "tf_unittest_runner.py")
  - if 'GPU' in backend:
  + if backend is not None and 'GPU' in backend:
  test_manifest_file = os.path.join(test_src_dir,
  "python_tests_list_gpu.txt")
  else:
  