In-depth uselessness, have empty element definition return false always.
In-depth uselessness, have empty element definition return false always.

git-svn-id: 07e90cf55c51d05f6e47e58d22f17c514a1aa358@53 48356398-32a2-884e-a903-53898d9a118a

ezyang/htmlpurifier,r-kovalenko/htmlpurifier,r-kovalenko/htmlpurifier,r-kovalenko/htmlpurifier,bartbutler/htmlpurifier,ezyang/htmlpurifier,bfroehle/htmlpurifier,bartbutler/htmlpurifier,bfroehle/htmlpurifier,bfroehle/htmlpurifier,r-kovalenko/htmlpurifier,stefanotorresi/htmlpurifier,Janson-Leung/htmlpurifier,stefanotorresi/htmlpurifier,Janson-Leung/htmlpurifier,stefanotorresi/htmlpurifier,Masterjoa/HTMLPurifier-standalone,bartbutler/htmlpurifier,Masterjoa/HTMLPurifier-standalone,stefanotorresi/htmlpurifier,ezyang/htmlpurifier,Janson-Leung/htmlpurifier,Janson-Leung/htmlpurifier,bartbutler/htmlpurifier,ezyang/htmlpurifier