[fderp]

I can't imagine a situation where you need to know analytics are being consumed in order to give users the data they want (unless the site in question is itself an analytics site).

To allow / cause your site to break when analytics aren't served is, in essence, attempting to enforce an unspoken contract between gathering user info and serving them data.

As far as I'm concerned, a site that doesn't work when analytics aren't served is a site I will literally never use.