From forum post: http://forum.piwik.org/index.php?showtopic=2351
We can try using Image.onerror and launching an ajax request as a fallback. Note: this is subject to the samedomain policy, so piwik.js has to be hosted on the piwik server.
Wont fix, if images or JS are disabled, it is normal that Piwik doesn't make the request... Note that nobody would disable images anyway.