Index: openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl,v
diff -u -N -r1.7 -r1.8
--- openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl	26 Apr 2018 08:56:38 -0000	1.7
+++ openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl	9 May 2018 15:33:30 -0000	1.8
@@ -24,7 +24,7 @@
 set tree_length [llength $tree_list]
 
 # Create a list of values for the list filter
-set tree {}
+set tree [list]
 
 foreach element $tree_list {
     set ident [lindex $element 3]