NSUrlConnection wrapper returns "Bad Request" NSData instead of NSError #12

Steps :
Attempt to download a file from the URL that returns "HTTP 400" error.

Actual result : "Bad request" string is returned in plain text
Expected result : A valid JHttpError is returned.

JFFAsyncOperation genericDataURLResponseLoader(JFFURLConnectionParams *params)
{
   return privateGenericDataURLResponseLoader(params, nil);
}

dataURLResponseLoader() implementation is missing the downloadErrorFlagResponseAnalyzer() predicate (nil is used as a stub). Adding the mentioned predicate solves the issue but some backward compatibility checks (code review) are required.