--- parser.php	Fri Apr 01 11:29:18 2005
+++ parser_new.php	Fri Apr 01 11:31:08 2005
@@ -1291,7 +1291,8 @@
 					}
 					$wgLinkCache->addCategoryLinkObj( $nt, $sortkey );
 					$this->mOutput->addCategoryLink( $t );
-					$s .= $prefix . $trail ;
+					$tmp = $prefix . $trail ;
+					$s .= (trim($tmp) == '')? '': $tmp;
 					
 					wfProfileOut( "$fname-category" );
 					continue;