code: def test_hex_tiles_empty(self):
      tiles = HexTiles([])
      mpl_renderer.get_plot(tiles)
  
imports: import numpy
  from holoviews.element import HexTiles
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 1 for calling the TestHexTilesPlot obj's underlying member method code with example usage: obj.test_hex_tiles_empty() without return types