The tests fail if XML::OPML::SimpleGen isn't installed.
See http://www.cpantesters.org/cpan/report/baeac1da-ae06-11df-93e0-
675c5b4ccdc3
If an installation doesn't have XML::OPML::SimpleGen and the config file
requests OPML generation we should:
* Warn the user (not die)
* Disable OPML generation
(Pretty sure we used to do it like this)