Crash, when the response object is not set

[atorian]

Bundle crashes when response object is Null.
It happens, for example, in case of curl timeout.

There is a clone of bundle with a fix https://github.com/hanikesn/LswGuzzleBundle
but as i see author didn't made pull request.
Probably solution is not best, but it works.

Other question is Guzzle dependency is "*" means bundle will fail on big update.
Probably should be fixed.