add logger explicit;cleanup;correct cs

Client.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace FOQ\ElasticaBundle;
 
 use Elastica_Client;
@@ -8,13 +9,18 @@ use Elastica_Client;
  */
 class Client extends Elastica_Client
 {
+    protected $logger;
+
     public function setLogger($logger)
     {
         $this->logger = $logger;
     }
 
-    public function request($path, $method, $data = array()) {
-        $this->logger->logQuery($path, $method, $data);
+    public function request($path, $method, $data = array())
+    {
+        if (null !== $this->logger) {
+            $this->logger->logQuery($path, $method, $data);
+        }
 
         return parent::request($path, $method, $data);
     }