--- loncom/interface/coursecatalog.pm	2021/06/15 20:52:26	1.105
+++ loncom/interface/coursecatalog.pm	2025/02/24 13:40:33	1.107
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for displaying the course catalog interface
 #
-# $Id: coursecatalog.pm,v 1.105 2021/06/15 20:52:26 raeburn Exp $
+# $Id: coursecatalog.pm,v 1.107 2025/02/24 13:40:33 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -357,8 +357,12 @@ function check_selected() {
 }
 ENDJS
             }
-            $catjs = '<script type="text/javascript">'."\n".$catjs."\n".'</script>';
-            &cat_header($r,$codedom,$catjs,\%add_entries,$catlinks,undef,$cattype);
+            my $js = '<script type="text/javascript">'."\n".
+                     '// <![CDATA['."\n".
+                     "$catjs\n".
+                     '// ]]>'."\n".
+                     '</script>';
+            &cat_header($r,$codedom,$js,\%add_entries,$catlinks,undef,$cattype);
             if ($env{'form.currcat_0'} ne '') {
                 $r->print('<form name="'.$formname.
                           '" method="post" action="/adm/coursecatalog">'.
@@ -1891,7 +1895,13 @@ sub courseinfo_row {
             @cats = split('&',$categories);
         }
         if ((ref($trails) eq 'ARRAY') && (ref($allitems) eq 'HASH')) {
-            my @categories = map { $trails->[$allitems->{$_}]; } @cats;
+            my @categories;
+            foreach my $cat (@cats) {
+                next if ($cat eq '');
+                if (($allitems->{$cat} ne '') && ($trails->[$allitems->{$cat}] ne '')) {
+                    push(@categories,$trails->[$allitems->{$cat}]);
+                }
+            }
             $categorylist = join('<br />',@categories);
         }
         if ($categorylist eq '') {