If anyone wonders: I now learned that there is a way to configure an empty chain. You can't have an empty (0 byte) file as the certificate chain, but you can have a file that contains just a newline (1 byte) and nothing else and set that as the chain.
-- Hanno Böck http://hboeck.de/ mail/jabber: ha...@hboeck.de GPG: BBB51E42
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