XHTML list in threads.html

[clansco <falsetti@xxxxxxxxxxx>]

Hello,
thanks for MHonArc.

1) lists in threads.html begin with <ul> but this tag is 
not closed at the and of the list.

2) MHonArc produces <li><li></li></li>,
when <em>Message not available</em>
 expected : <li><ul><li></li></ul></li>
or protected by depth in list :
 expected : <li></li><li></li>

example at :
http://listes.artlibre.org/copyleft_attitude/2000/
source :
http://listes.artlibre.org/copyleft_attitude/2000/MAIL
original threads.html :
http://listes.artlibre.org/copyleft_attitude/2000/old_threads.html
manual corrected :
http://listes.artlibre.org/copyleft_attitude/2000/threads.html
diff :
http://listes.artlibre.org/copyleft_attitude/2000/ul.diff
mrc :
http://listes.artlibre.org/copyleft_attitude/2000/lal_latin1.mrc

regards,
ff