Fix the 0-dim test to use the proper op.

theano/tensor/tests/test_subtensor.py

@@ -161,7 +161,7 @@ class T_subtensor(unittest.TestCase, utt.TestOptimizationMixin):
 
     def test1_0_dims(self):
         n = self.shared(numpy.ones((), dtype=self.dtype))
-        t = theano.tensor.Subtensor([])(n)
+        t = self.sub([])(n)
         self.assertTrue(isinstance(t.owner.op, Subtensor))
         mode = self.mode
         self.mode = mode.excluding("local_useless_subtensor")
@@ -188,7 +188,6 @@ class T_subtensor(unittest.TestCase, utt.TestOptimizationMixin):
         self.assertTrue(tval == 5.0)
 
     def test1_ok_range_infinite(self):
-        #Subtensor.debug = True
         n = self.shared(numpy.arange(3, dtype=self.dtype))
         t = n[1:]
         self.assertTrue(isinstance(t.owner.op, Subtensor))