Index: openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.adp
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.adp,v
diff -u -r1.3 -r1.4
--- openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.adp	24 Jun 2005 04:08:45 -0000	1.3
+++ openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.adp	20 Jul 2005 16:40:21 -0000	1.4
@@ -1,3 +1,5 @@
+xx@used_categories@xx
+
 <STYLE TYPE="text/css">
 table.list {
   font-family: tahoma, verdana, helvetica; 
Index: openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.tcl,v
diff -u -r1.20 -r1.21
--- openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.tcl	20 Jul 2005 11:35:33 -0000	1.20
+++ openacs-4/packages/dotlrn-ecommerce/lib/tree-chunk.tcl	20 Jul 2005 16:40:21 -0000	1.21
@@ -94,6 +94,27 @@
 #set category_trees [linsert [category_tree::get_mapped_trees $package_id] 0 $tree_id]
 #set category_trees [category_tree::get_mapped_trees $cc_package_id]
 
+# Display only categories with associated courses/sections
+set used_categories [db_list used_categories {
+    select distinct category_id
+    from (
+
+    select category_id
+    from categories c
+    where exists (select 1
+		  from category_object_map
+		  where category_id in (select category_id
+					from categories
+					where left_ind > c.left_ind
+					and right_ind < c.right_ind))
+    union
+
+    select category_id
+    from category_object_map
+
+    ) c
+}]
+
 foreach tree_id $category_trees {
 
     set tree_id [lindex $tree_id 0]
@@ -107,12 +128,14 @@
     set $name [list]
 
     foreach element $tree_list {
-	set ident [lindex $element 3]
-	set spacer ""
-	for { set i 1 } { $i < $ident } { incr i } {
-	    append spacer ". . "
+	if { [lsearch $used_categories [lindex $element 0]] != -1 } {
+	    set ident [lindex $element 3]
+	    set spacer ""
+	    for { set i 1 } { $i < $ident } { incr i } {
+		append spacer ". . "
+	    }
+	    lappend $name [list "${spacer}[lindex "$element" 1]" "[lindex $element 0]&level=[lindex $element 3]" ]
 	}
-	lappend $name [list "${spacer}[lindex "$element" 1]" "[lindex $element 0]&level=[lindex $element 3]" ]
     }
 
     regsub -all { } $name _ f