message: js(build): fix generator with Python3
  class_info.props is a 'list'
diff: @@ -820,7 +820,7 @@ class JSWrapperGenerator(object):
  # Generate bindings for properties
  - for property in sorted(class_info.props):
  + for property in class_info.props:
  _class_property = class_property_enum_template if property.tp in type_dict else class_property_template
  class_bindings.append(_class_property.substitute(js_name=property.name, cpp_name='::'.join(
  [class_info.cname, property.name])))
  