juju/juju — pull request #474 by tasdomas (2014-08-06 13:07:47+00:00)
Title: Alter the behavior of opening and closing ports

Closing a port range that has not been opened will not result in an error.

This is an outcome of the discussions on the juju-dev mailing list. Furthermore it follows the practices adopted by charm authors, where closing a port that was not open is often expected to be a noop.