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serialize_table will emit invalid XHTML if the passed-in table has no rows. Fixing it to just "return ()", ie. an empty list if no rows given seems obvious, but I haven't checked if it has side effects. And that fix is 0.6-branch specific, dunno ATM if the new template code is affected. Reported by Nick Waterman in <http://lists.w3.org/Archives/Public/www-validator/2002Dec/0011.html>
The fix for Bug #101 also takes care of this. It is a bug if &serialize_table is ever called without any rows in the passed in table. Besides, the template code makes this issue moot.