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BadRequest: object of type 'NoneType' has no len() (HTTP 400)

RHEL 6.5.

I attempted to create an instance via HEAT. The creation of the instance failed (which I expected, no problem there). However, when the instance was being rolled back, the final status came back with (from the heat.log file) failed status, and:

BadRequest: object of type 'NoneType' has no len() (HTTP 400)

Any suggestions?