--- loncom/homework/grades.pm	2005/08/29 10:06:07	1.280
+++ loncom/homework/grades.pm	2005/09/01 15:23:23	1.282
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # The LON-CAPA Grading handler
 #
-# $Id: grades.pm,v 1.280 2005/08/29 10:06:07 foxr Exp $
+# $Id: grades.pm,v 1.282 2005/09/01 15:23:23 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -471,6 +471,10 @@ sub most_similar {
 
     $uessay=~s/\W+/ /gs;
 
+# ignore empty submissions (occuring when only files are sent)
+
+    unless ($uessay=~/\w+/) { return ''; }
+
 # these will be returned. Do not care if not at least 50 percent similar
     my $limit=0.6;
     my $sname='';
@@ -2656,7 +2660,6 @@ sub viewgrades {
 sub viewstudentgrade {
     my ($url,$symb,$courseid,$student,$fullname,$parts,$weight,$ctr,$last_resets) = @_;
     my ($uname,$udom) = split(/:/,$student);
-    $student=~s/:/_/;
     my %record=&Apache::lonnet::restore($symb,$courseid,$udom,$uname);
     my %aggregates = (); 
     my $result='<tr bgcolor="#ffffdd"><td align="right">'.
@@ -2665,6 +2668,7 @@ sub viewstudentgrade {
 	'<a href="javascript:viewOneStudent(\''.$uname.'\',\''.$udom.
 	'\')"; TARGET=_self>'.$fullname.'</a> '.
 	'<font color="#999999">('.$uname.($env{'user.domain'} eq $udom ? '' : ':'.$udom).')</font></td>'."\n";
+    $student=~s/:/_/; # colon doen't work in javascript for names
     foreach my $apart (@$parts) {
 	my ($part,$type) = &split_part_type($apart);
 	my $score=$record{"resource.$part.$type"};
@@ -2786,12 +2790,10 @@ sub editgrades {
     for ($i=0; $i<$env{'form.total'}; $i++) {
 	my $line;
 	my $user = $env{'form.ctr'.$i};
-	my $usercolon = $user;
-	$usercolon =~s/_/:/;
-	my ($uname,$udom)=split(/_/,$user);
+	my ($uname,$udom)=split(/:/,$user);
 	my %newrecord;
 	my $updateflag = 0;
-	$line .= '<td>'.&nameUserString(undef,$$fullname{$usercolon},$uname,$udom).'</td>';
+	$line .= '<td>'.&nameUserString(undef,$$fullname{$user},$uname,$udom).'</td>';
 	my $usec=$classlist->{"$uname:$udom"}[5];
 	if (!&canmodify($usec)) {
 	    my $numcols=scalar(@partid)*4+2;
@@ -2800,6 +2802,7 @@ sub editgrades {
 	}
         my %aggregate = ();
         my $aggregateflag = 0;
+	$user=~s/:/_/; # colon doen't work in javascript for names
 	foreach (@partid) {
 	    my $old_aw    = $env{'form.GD_'.$user.'_'.$_.'_awarded_s'};
 	    my $old_part_pcr = $old_aw/($weight{$_} ne '0' ? $weight{$_}:1);