Comment 4 for bug 1717265

The interesting part of the above is that while it isn't empty, it doesn't have anywhere near as much as a regular context. All of the values set to None in preiodic.py[1] do have a value, so I am not sure that is likely the issue.

[1]: https://github.com/openstack/mistral/blob/b8d1e096e4cd5869e868cb7ad7101c52f93ea7d1/mistral/services/periodic.py#L141-L146