make null format look nice by default

web/css/site.css

@@ -19,6 +19,11 @@ body {
 	padding: 14px 24px;
 }
 
+.not-set {
+	color: #c55;
+	font-style: italic;
+}
+
 /* add sorting icons to gridview sort links */
 a.asc:after, a.desc:after {
     position: relative;