Index: openacs-4/packages/xowiki/tcl/category-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/category-procs.tcl,v
diff -u -N -r1.15 -r1.16
--- openacs-4/packages/xowiki/tcl/category-procs.tcl	7 Nov 2008 18:28:35 -0000	1.15
+++ openacs-4/packages/xowiki/tcl/category-procs.tcl	4 Jan 2009 19:24:39 -0000	1.16
@@ -32,6 +32,7 @@
   CatTree instproc open_tree {} {;}
 
   CatTree instproc render {{-tree_style:boolean false}} {
+    set content ""
     if {$tree_style} {
       #::xo::Page requireCSS "/resources/acs-templating/mktree.css"
       ::xo::Page requireCSS  "/resources/xowiki/cattree.css"