TypeError: 'NoneType' object is not iterable

[ftomza]

Exceptions:

TypeError: 'NoneType' object is not iterable
(2 additional frame(s) were not displayed)
...
  File "sentry/api/base.py", line 90, in handle_exception
    response = super(Endpoint, self).handle_exception(exc)
  File "sentry/api/base.py", line 190, in dispatch
    response = handler(request, *args, **kwargs)
  File "sentry/api/endpoints/project_plugin_details.py", line 129, in put
    initial=request.DATA,

TypeError: 'NoneType' object is not iterable
(6 additional frame(s) were not displayed)
...
  File "sentry/api/endpoints/project_plugin_details.py", line 185, in put
    context = serialize(plugin, request.user, PluginWithConfigSerializer(project))
  File "sentry/api/serializers/base.py", line 17, in serialize
    return serialize([objects], user=user, serializer=serializer, **kwargs)[0]
  File "sentry/api/serializers/base.py", line 38, in serialize
    return [serializer(o, attrs=attrs.get(o, {}), user=user, **kwargs) for o in objects]
  File "sentry/api/serializers/base.py", line 53, in __call__
    return self.serialize(obj, attrs, user, **kwargs)
  File "sentry/api/serializers/models/plugin.py", line 86, in serialize
    for c in obj.get_config(project=self.project, user=user, add_additial_fields=True)

These errors associated with changes in the data schema YouTrack, model Projects. Before the change was:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<projects></projects>

In version 2019.1 it became:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<projectShorts></projectShorts>

The plug-in has functions for obtaining pre-arranged enumerations, but depending on the installation and its localization, they have different names. For example, in the installation en-en 'Types', and in the installation ru-ru 'Типы'