Don't get in the try except above, by checking for the attribute manually and…

theano/tensor/opt.py

@@ -754,6 +754,9 @@ class ShapeFeature(object):
 
     def shape_tuple(self, r):
         """Return a tuple of symbolic shape vars for tensor variable r"""
+        if not hasattr(r, 'ndim'):
+            # This happen for NoneConst.
+            return None
         return tuple([self.shape_ir(i, r) for i in xrange(r.ndim)])
 
     def default_infer_shape(self, node, i_shapes):