--- loncom/homework/grades.pm	2006/03/11 00:08:48	1.332
+++ loncom/homework/grades.pm	2006/03/13 20:26:51	1.333
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Grading handler
 #
-# $Id: grades.pm,v 1.332 2006/03/11 00:08:48 albertel Exp $
+# $Id: grades.pm,v 1.333 2006/03/13 20:26:51 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -5003,7 +5003,7 @@ sub scantron_get_correction {
 #the previous one or the current one
 
     $r->print("<p><b>An error was detected ($error)</b>");
-    if ( defined($$scan_record{'scantron.PaperID'}) ) {
+    if ( $$scan_record{'scantron.PaperID'} =~ /\S/) {
 	$r->print(" for PaperID <tt>".
 		  $$scan_record{'scantron.PaperID'}."</tt> \n");
     } else {