Merge pull request #286 from lshchur/patch-1

Update Data.php (it was using for hashing only attributes that have setting "Filterable", and I've added also "Filterable (no results)")

app/code/community/Lesti/Fpc/Helper/Data.php

@@ -182,7 +182,7 @@ protected function _getLayeredNavigationAttributes()
             $layeredNavigationAttributesCache = $cache->load($cacheId);
 
             if (!$layeredNavigationAttributesCache) {
-                $attributeCollection->addFieldToFilter($filterableField, true);
+                $attributeCollection->addFieldToFilter($filterableField, array('in' => array(1,2)));
                 foreach ($attributeCollection as $attribute) {
                     $layeredNavigationAttributes[] = $attribute->getAttributeCode();
                 }