Better error messase in reshape.

theano/tensor/basic.py

@@ -4480,6 +4480,11 @@ class Reshape(Op):
 
 def reshape(x, newshape, ndim=None, name=None):
     if ndim is None:
+        newshape = as_tensor_variable(newshape)
+        if newshape.ndim != 1:
+            raise TypeError(
+                "New shape in reshape must be a vector or a list/tuple of"
+                " scalar. Got %s after conversion to a vector." % newshape)
         try:
             ndim = get_vector_length(newshape)
         except ValueError: