code: def test_get_actor_no_input(ray_start_regular_shared):
      for bad_name in [None, "", "    "]:
          with pytest.raises(ValueError):
              ray.get_actor(bad_name)
  
imports: import os
  import sys
  import time
  import numpy
  import pytest
  import ray
  import ray._private.gcs_utils
  from ray.util.state import list_actors
  import ray.cluster_utils
  from ray._private.test_utils import SignalActor, convert_actor_state, kill_actor_and_wait_for_failure, make_global_state_accessor, run_string_as_driver, wait_for_condition, wait_for_pid_to_exit
  from ray._private.ray_constants import gcs_actor_scheduling_enabled
  from ray.experimental.internal_kv import _internal_kv_get, _internal_kv_put
label_desc: Use image node_id 27 for calling a global function with example usage: test_get_actor_no_input(ray_start_regular_shared) without return types