code: def testGetModelState_ReturnsNotReady_IfEmptyState(self):
      # Prepare stub and client.
      self.model_stub.GetModelStatus.return_value = _make_response(
          {"model_version_status": []}  # Empty
      )
      client = tensorflow_serving_client.TensorFlowServingClient(
          "localhost:1234", "a_model_name"
      )
  
      # Calls
      result = client._GetServingStatus()
  
      # Check result.
      self.assertEqual(result, types.ModelServingStatus.NOT_READY)
  
imports: from typing import Any, Dict
  from unittest import mock
  import grpc
  import tensorflow
  from tfx.components.infra_validator import error_types
  from tfx.components.infra_validator import types
  from tfx.components.infra_validator.model_server_clients import tensorflow_serving_client
  from google.protobuf import json_format
  from tensorflow_serving.apis import classification_pb2
  from tensorflow_serving.apis import get_model_status_pb2
  from tensorflow_serving.apis import regression_pb2
label_desc: Use image node_id 6 for calling the TensorflowServingClientTest obj's underlying member method code with example usage: obj.testGetModelState_ReturnsNotReady_IfEmptyState() without return types