Should not return false when the key don't exist

[estheban]

class KeyValueStore

/**
     * Gets the value of the exact key
     *
     * @param string $key
     * @return mixed
     */
    public function get($key)
    {
        $value = $this->em->getRepository('ElcwebKeyValueStoreBundle:KeyValue')->findOneByKey($key);

        if (!$value) {
            return false;
        }

        return $value->getValue();
    }