AFNetworking/AFNetworking — pull request #772 by 0xced (2013-02-01 11:26:04+00:00)
Title: Compare NSURLRequest rather than NSURL

If you inadvertently load a nil URL in UIImageView+AFNetworking, the failure block of the image request operation is bypassed because `[nil isEqual:nil] == NO`. By comparing the URL request instead of the URL, the `isEqual:` test passes and the error is properly forwarded to the failure block parameter.