The xmlnode API didn't check for the empty string ("") as
node name, which leads to...broken XML. I added those
checks to xmlnode, and fixed this occurrence in usermood.
Fixes #14342
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
version="1.0">
<!-- Based on http://bur.st/~eleusis/devhelp/doxy2devhelp.xsl
(http://bur.st/~eleusis/devhelp/README)
which is based on http://bugzilla.gnome.org/show_bug.cgi?id=122450