make publisher and publishedDate optional

diff --git a/GoogleBooks.pm b/GoogleBooks.pm
index 8bcf0ed..7806425 100644 (file)
--- a/GoogleBooks.pm
+++ b/GoogleBooks.pm
@@ -134,10 +134,12 @@ sub next_marc {
                        $vi->{subtitle} ? ( 'b' => $vi->{subtitle} ) : (),
                );
 
-               $marc->add_fields(260,' ',' ',
-                       $vi->{publisher} ? ( 'b' => $vi->{publisher} ) : (),
-                       $vi->{publishedDate} ? ( 'c' => $vi->{publishedDate} ) : ()
-               );
+               if ( exists $vi->{publisher} or exists $vi->{publishedDate} ) {
+                       $marc->add_fields(260,' ',' ',
+                               $vi->{publisher} ? ( 'b' => $vi->{publisher} ) : (),
+                               $vi->{publishedDate} ? ( 'c' => $vi->{publishedDate} ) : ()
+                       );
+               }
 
                $marc->add_fields(300,' ',' ','a' => $vi->{pageCount} . 'p.' ) if $vi->{pageCount};