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
/** @page gtkblist-signals GtkBlist Signals
@signals
@signal gtkblist-hiding
@signal gtkblist-unhiding
@signal gtkblist-created
@signal drawing-tooltip
@signal drawing-buddy
@endsignals
@see gtkblist.h
<hr>
@signaldef gtkblist-hiding
@signalproto
void (*gtkblist-hiding)(PurpleBuddyList *blist);
@endsignalproto
@signaldesc
Emitted when the buddy list is about to be hidden.