Now test CAReduce on arrays with one zero-length dimension.

theano/tensor/tests/test_elemwise.py

@@ -133,6 +133,8 @@ class test_CAReduce(unittest.TestCase):
                            ((5, 6), (1, )),
                            ((5, 6), ()),
                            ((2, 3, 4, 5), (0, 1, 3)),
+                           ((5, 0), (0, )),
+                           ((5, 0), (1, )),
                            ((), ())]:
             x = TensorType('float64', [(entry == 1) for entry in xsh])('x')
             e = CAReduce(add, axis = tosum)(x)