--- loncom/lonnet/perl/lonnet.pm	2002/10/03 15:04:29	1.290
+++ loncom/lonnet/perl/lonnet.pm	2002/10/03 22:32:53	1.291
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.290 2002/10/03 15:04:29 www Exp $
+# $Id: lonnet.pm,v 1.291 2002/10/03 22:32:53 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2599,7 +2599,7 @@ sub courseresdata {
 	    return $courseresdatacache{$hashid}->{$item};
 	}
     }
-    return '';
+    return undef;
 }
 
 # --------------------------------------------------------- Value of a Variable