Send hidden but checked items to solr; there's no way to know ahead of

time if the result set will have changed, where the currently hidden
item becomes valid.

@@ -450,7 +450,7 @@ define(function(require) {
                 facetValues.push(rangeFormatter(queryMin, queryMax));
             }
             this.get('items').each(function(item, index) {
-                if (!item.get('hidden') && item.get('checked')) {
+                if (item.get('checked')) {
                     facetValues.push(valueFormatter(item));
                 }
             });