code: def test_agg_ndarray_sum_empty():
      no_values = hl.utils.range_table(0).annotate(x=hl.nd.arange(5))
      assert (
          no_values.aggregate(hl.agg.ndarray_sum(no_values.x)) is None
      )
  
imports: import math
  import numpy
  import re
  from ..helpers import *
  import pytest
  from hail.utils.java import FatalError, HailUserError
label_desc: Use image node_id 44 for calling a global function with example usage: test_agg_ndarray_sum_empty() without return types