code: def testEmptyChords(self):
      self.assertComputeFails(ChordsDescriptors(), [], "A", "minor")
  
file_path: essentia/test/src/unittests/tonal/test_chordsdescriptors.py
imports: from essentia_test import *
  from essentia.streaming import ChordsDescriptors
label_desc: Use image node_id 13 for calling the TestChordsDescriptors obj's underlying member method code with example usage: obj.testEmptyChords() without return types