I hate useragent strings, but with the current state of the Web, your UA sticks out more if you omit the version header rather than copying a common one.
That's still no excuse for a webserver to deny requests by (lack of) UA string, but I doubt that what you're doing is beneficial for any reason.
That's still no excuse for a webserver to deny requests by (lack of) UA string, but I doubt that what you're doing is beneficial for any reason.