code: def testEmpty(self):
      original_signal = []
      self.assertRaises(
          RuntimeError, lambda: MaxFilter()(original_signal)
      )
  
file_path: essentia/test/src/unittests/filters/test_maxfilter.py
imports: from essentia_test import *
  from math import *
  from numpy import *
  from essentia import *
  from math import *
  import essentia.standard
label_desc: Use image node_id 2 for calling the TestMaxFilter obj's underlying member method code with example usage: obj.testEmpty() without return types