Fix crash in new check in the scan op.

theano/scan_module/scan_op.py

@@ -1000,7 +1000,7 @@ class Scan(PureOp):
         # is the shape of self.inputs[i]
 
         for inp, inp_shp in izip(node.inputs, input_shapes):
-            assert inp_shp is None or len(inp_shp) == inp.ndim
+            assert inp_shp is None or len(inp_shp) == inp.type.ndim
 
         # sequences
         # We skip iputs_shapes[0] as it is the total or current number