--- loncom/interface/lonnavmaps.pm	2003/09/24 15:58:06	1.234
+++ loncom/interface/lonnavmaps.pm	2003/09/29 21:07:10	1.235
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.234 2003/09/24 15:58:06 matthew Exp $
+# $Id: lonnavmaps.pm,v 1.235 2003/09/29 21:07:10 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3547,7 +3547,11 @@ sub responseType {
     my $part = shift;
 
     $self->extractParts();
-    return @{$self->{RESPONSE_TYPES}->{$part}};
+    if (defined($self->{RESPONSE_TYPES}->{$part})) {
+	return @{$self->{RESPONSE_TYPES}->{$part}};
+    } else {
+	return undef;
+    }
 }
 
 sub responseIds {
@@ -3555,7 +3559,11 @@ sub responseIds {
     my $part = shift;
 
     $self->extractParts();
-    return @{$self->{RESPONSE_IDS}->{$part}};
+    if (defined($self->{RESPONSE_IDS}->{$part})) {
+	return @{$self->{RESPONSE_IDS}->{$part}};
+    } else {
+	return undef;
+    }
 }
 
 # Private function: Extracts the parts information, both part names and