Comment 2 for bug 1717265

The context passed to the run function is empty when the workflow is run from the cron trigger, and properly populated when triggered manually from the CLI.

This is likely caused by the MistralContext being initialized as empty here:

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