code: def test_nodes_to_queries_mt(self):
      df = pd.DataFrame({"n": [], "v1": []})
      g = PlotterBase()
      assert (
          len(
              [
                  x
                  for x in nodes_to_queries(
                      g.nodes(df, "n"), untyped=True
                  )
              ]
          )
          == 0
      )
  
imports: from typing import Iterable
  import os, numpy, pandas, pyarrow, pytest, queue
  from common import NoAuthTestCase
  from concurrent.futures import Future
  from mock import patch
  from gremlin_python.driver.resultset import ResultSet
  from gremlin_python.structure.graph import Vertex, Edge, Path
  from graphistry.gremlin import CosmosMixin, GremlinMixin, DROP_QUERY, nodes_to_queries, edges_to_queries
  from graphistry.plotter import PlotterBase
label_desc: Use image node_id 17 for calling the TestGremlinMixin obj's underlying member method code with example usage: obj.test_nodes_to_queries_mt() without return types