added capture of ^@ 

I had an unit test where I want to verify following method:

    - (NSDictionary *)sendRequestWithParameters:(NSDictionary *)parameters error:(NSError **)error

and 

    [verifyCount(serverRequest, never()) sendRequestWithParameters:(id) anything() error:nil];

This unit test did fail, because the NSError ** was not capture and an "-- Unhandled type" exception was thrown. I have added that a NSObject** is captured which fixes this issue.