docstr: Tests creating a spatial index from an empty GeoSeries.
code: def test_empty_geoseries(self):
      """Tests creating a spatial index from an empty GeoSeries."""
      s = GeoSeries(dtype=object)
      assert not s.sindex
      assert len(s.sindex) == 0
  
imports: from math import sqrt
  import numpy
  import pandas
  import pytest
  import shapely
  from numpy.testing import assert_array_equal
  from shapely.geometry import GeometryCollection, LineString, MultiPolygon, Point, Polygon, box
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries, read_file
  from geopandas import _compat
label_desc: Use image node_id 2 for calling the TestSeriesSindex obj's underlying member method code with example usage: obj.test_empty_geoseries() without return types