code: def testVectorEmpty(self):
      p = Pool()
      p.add("foo.bar", [1])
      p.add("foo.bar", [])
  
      self.assertEqualMatrix(p["foo.bar"], [[1], []])
  
imports: from essentia_test import *
label_desc: Use image node_id 10 for calling the TestPool obj's underlying member method code with example usage: obj.testVectorEmpty() without return types