Ignore memcached missing key error on dession destroy

Author: jderusse

src/Symfony/Component/HttpFoundation/Session/Storage/Handler/MemcacheSessionHandler.php

@@ -95,7 +95,9 @@ public function write($sessionId, $data)
      */
     public function destroy($sessionId)
     {
-        return $this->memcache->delete($this->prefix.$sessionId);
+        $this->memcache->delete($this->prefix.$sessionId);
+
+        return true;
     }
 
     /**

src/Symfony/Component/HttpFoundation/Session/Storage/Handler/MemcachedSessionHandler.php

@@ -101,7 +101,9 @@ public function write($sessionId, $data)
      */
     public function destroy($sessionId)
     {
-        return $this->memcached->delete($this->prefix.$sessionId);
+        $result = $this->memcached->delete($this->prefix.$sessionId);
+
+        return $result || $this->memcached->getResultCode() == \Memcached::RES_NOTFOUND;
     }
 
     /**