最新服务器上的版本,以后用这个
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AutoFormat.RemoveEmpty.Predicate
TYPE: hash
VERSION: 4.7.0
DEFAULT: array('colgroup' => array(), 'th' => array(), 'td' => array(), 'iframe' => array('src'))
--DESCRIPTION--

Given that an element has no contents, it will be removed by default, unless this predicate dictates otherwise. The predicate can either be an associative map from tag name to list of attributes that must be present for the element to be considered preserved: thus, the default always preserves colgroup, th and td, and also iframe if it has a src.

--# vim: et sw=4 sts=4