message: add tests for empty result
diff: @@ -390,7 +390,7 @@ def test_empty_result(postgres_url: str) -> None:
  )
  assert_frame_equal(df, expected, check_names=True)
  -def test_empty_result_on_single_partition(postgres_url: str) -> None:
  +def test_empty_result_on_some_partition(postgres_url: str) -> None:
  query = "SELECT * FROM test_table where test_int < 1"
  df = read_sql(postgres_url, query, partition_on="test_int", partition_num=3)
  expected = pd.DataFrame(
  