Remove useless opt error to the user (and maybe move more stuff to the GPU)

theano/sandbox/cuda/opt.py

@@ -795,6 +795,11 @@ def local_gpu_careduce(node):
             replace = False
             if x.owner and isinstance(x.owner.op, HostFromGpu):
                 replace = True
+            # If this is a useless reduce, remove it as
+            # local_cut_useless_reduce.  This is needed as the code
+            # bellow do not support when x.ndim == 0.
+            if x.type == node.outputs[0].type:
+                return [x]
             elif (all([c != "output" and isinstance(c.op, GpuFromHost)
                       for c, i in node.outputs[0].clients])
                   and x.owner and x.owner.op.__class__ in