--- loncom/interface/lonmeta.pm	2001/12/24 23:01:31	1.12
+++ loncom/interface/lonmeta.pm	2001/12/25 21:02:35	1.13
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Metadata display handler
 #
-# $Id: lonmeta.pm,v 1.12 2001/12/24 23:01:31 www Exp $
+# $Id: lonmeta.pm,v 1.13 2001/12/25 21:02:35 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -29,7 +29,7 @@
 #
 # 05/29/00,05/30,10/11 Gerd Kortemeyer)
 #
-# 10/19,10/21,10/23,11/27,08/09/01,12/22,12/24 Gerd Kortemeyer
+# 10/19,10/21,10/23,11/27,08/09/01,12/22,12/24,12/25 Gerd Kortemeyer
 
 package Apache::lonmeta;
 
@@ -100,6 +100,7 @@ sub dynamicmeta {
 
 sub evalgraph {
     my $value=shift;
+    unless ($value) { return ''; }
     my $val=int($value*10.+0.5)-10;
     my $output='<table border=0 cellpadding=0 cellspacing=0><tr>';
     if ($val>=20) {
@@ -121,9 +122,10 @@ sub evalgraph {
 
 sub diffgraph {
     my $value=shift;
+    unless ($value) { return ''; }
     my $val=int(40.0*$value+0.5);
-    my @colors=('#FF3333','#EEBB33','#BBEE33','#33FF33',
-                '#33FF33','#BBEE33','#EEBB33','#FF3333');
+    my @colors=('#FF9933','#EEAA33','#DDBB33','#CCCC33',
+                '#BBDD33','#CCCC33','#DDBB33','#EEAA33');
     my $output='<table border=0 cellpadding=0 cellspacing=0><tr>';
     for (my $i=0;$i<8;$i++) {
 	if ($val>$i*5) {