The Empty Mail Filter is the best one to catch such mails. In the new (stable) Spamihilator beta 0.9.9.59, which is the release candidate for a 1.0 coming soon, the Empty Mail Filter doesn't run any more, but it is very easy to create a rule for it in the new Rule Filter. You can only bypass the training area with the friends list or the blocked senders list, as far as I remember ...
Vostro 3450, Intel Core i5 2410M 2,3 GHz, 4 GB DDR3 SDRAM 1333 MHz, Windows 7 Pro 64 Bit SP1
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