Prevent LogicExeption when executing sensors with drush

Problem/Motivation

LogicException: Render context is empty, because render() was called outside of a renderRoot() or renderPlain() call. Use renderPlain()/renderRoot()

Happens for example with token.module requirements sensor.

Proposed resolution

Execute in a render context?

Possibly the bug is also in token module and we need to fix it there.

Remaining tasks

User interface changes

API changes

Data model changes