add check for paginator theme before setting it in gateway

Author: reecefowell

Model/Component/Gateway/BaseGateway.php

@@ -193,7 +193,10 @@ public function all(QueryBuilder $qb, $parameters = array())
     public function paginateQuery(QueryBuilder $qb, $itemsPerPage, $page)
     {
         $pager = $this->paginator->paginate($qb, $page, $itemsPerPage);
-        $pager->setTemplate($this->pagerTheme);
+        
+		if ($this->pagerTheme) {
+			$pager->setTemplate($this->pagerTheme);
+		}
 
         return $pager;
     }