Fix image loading in mnist 5

This merge request fixes the loading of the database image.

advanced/databases/mnist/5.py

@@ -82,7 +82,7 @@ class View(BaseView):
 
         elif output == 'image':
             return {
-                'value': obj.image.reshape((28, 28))
+                'value': np.array(obj.image).reshape((28, 28))
             }