Make get_scalar_constant_value compatible with NoneTypes

theano/tensor/basic.py

@@ -470,7 +470,10 @@ def get_scalar_constant_value(
                 data = v.tag.unique_value
             else:
                 data = v.data
-            return numpy_scalar(data).copy()
+            if isinstance(data, np.ndarray):
+                return numpy_scalar(data).copy()
+            else:
+                return data
 
         if not only_process_constants and getattr(v, "owner", None) and max_recur > 0:
             max_recur -= 1