AFNetworking/AFNetworking — pull request #162 by koke (2012-01-05 16:49:06+00:00)
Title: Cancel request if there is an authentication challenge but no credentials for it

If no authenticationBlock is provided and a credential can't be found, call `continueWithoutCredentialForAuthenticationChallenge`. Otherwise, `connectionDidFinishLoading:` or `connection:didFailWithError:` never get called