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 -r1.6 -r1.7
--- openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl	29 Mar 2018 23:28:10 -0000	1.6
+++ openacs-4/packages/dotlrn-catalog/lib/tree-chunk.tcl	26 Apr 2018 08:56:38 -0000	1.7
@@ -24,7 +24,7 @@
 set tree_length [llength $tree_list]
 
 # Create a list of values for the list filter
-set tree [list]
+set tree {}
 
 foreach element $tree_list {
     set ident [lindex $element 3]