Routing Errors won't get rescued properly

When requesting an uri with no matching route the application raises the following exception:

      You have a nil object when you didn't expect it!
The error occurred while evaluating nil.request=
    /Users/LacKac/Working/Lab/test/vendor/rails/actionpack/lib/action_controller/base.rb:518:in `process_without_filters'

Reproducing the error is simple:

• create a blank application
• fire up script/server
• visit http://localhost:3000/wrong_uri
• check you development.log

The problem is that the call_with_exception method won't find the original request and response objects in the env hash because they're not yet set. I attached a patch which solves the problem by creating new request and response objects if they're not set. It's basically the same as in this commit by josh: http://github.com/rails/rails/co...

I couldn't come up with a test since not having those two env keys set will create new request and response objects wich will make it impossible to test based on changes made to a TestResponse instance.