code: def testMultipleEmptySlots(self):
      # Testing for non-zero number of empty slots
      multipleEmptySlots = [[], []]
      self.assertRaises(
          EssentiaException,
          lambda: RhythmTransform()(multipleEmptySlots),
      )
  
file_path: essentia/test/src/unittests/rhythm/test_rhythmtransform.py
imports: from essentia_test import *
  import numpy
label_desc: Use image node_id 4 for calling the TestRhythmTransform obj's underlying member method code with example usage: obj.testMultipleEmptySlots() without return types