Apply the proper fix for the XBlock atrributes loading

mentoring/light_children.py

@@ -84,7 +84,7 @@ class LightChildrenMixin(XBlockWithChildrenFragmentsMixin):
         for child_id, xml_child in enumerate(node):
             cls.add_node_as_child(block, xml_child, child_id)
 
-        for name, value in node.attrib.items():
+        for name, value in attr:
             if value == "false": value = False
             if value == "true": value = True
             setattr(block, name, value)
@@ -122,7 +122,7 @@ class LightChildrenMixin(XBlockWithChildrenFragmentsMixin):
             return
 
         node = etree.parse(StringIO(self.xml_content)).getroot()
-        LightChildrenMixin.init_block_from_node(self, node, {})
+        LightChildrenMixin.init_block_from_node(self, node, node.items())
 
     def get_children_objects(self):
         """