Fixed issue with request transfer info being injected for no reason

src/Factory/ClientFactory.php

@@ -34,7 +34,6 @@ public function __construct($class)
     {
         $this->class = $class;
         $this->subscribers = [];
-        $this->clientOptions = [];
     }
 
     /**
@@ -52,7 +51,7 @@ public function create(array $options = [], array $subscribers = [])
 
         if ($client instanceof HasEmitterInterface) {
             foreach ($this->subscribers as $name => $subscriber) {
-                if (!$subscribers || (isset($subscribers[$name]) && $subscribers[$name])) {
+                if (empty($subscribers) || (isset($subscribers[$name]) && $subscribers[$name])) {
                     $client->getEmitter()->attach($subscriber);
                 }
             }

src/Factory/DescriptionFactory.php

@@ -48,7 +48,7 @@ public function getDescription($alias)
      */
     public function loadDescriptions()
     {
-        if ($this->descriptions) {
+        if (!empty($this->descriptions)) {
             return;
         }
 

src/GuzzleHttp/Subscriber/CacheSubscriber.php

@@ -57,6 +57,6 @@ public function onBefore(BeforeEvent $event)
 
     public function onComplete(CompleteEvent $event)
     {
-        $this->storage->save($event->getRequest(), $event->getResponse(), $event->getTransferInfo());
+        $this->storage->save($event->getRequest(), $event->getResponse());
     }
 }

src/Tests/GuzzleHttp/Subscriber/CacheSubscriberTest.php

@@ -36,8 +36,7 @@ public function testFetch()
             ->method('save')
             ->with(
                 $this->isInstanceOf('GuzzleHttp\Message\RequestInterface'),
-                $this->equalTo($response),
-                $this->isType('array')
+                $this->equalTo($response)
             )
         ;
         $adapter