To test use eg
Then initialize tracker after document was loaded via
_paq.push. You will see tracker will be created etc. Also if someone else uses
_paq will be correctly restored to use the trackerproxy. Automated test is not possible for this.
Will issue a PR for Piwik 3 where we log a message and not create the tracker
New features in Piwik 3 only
FYI: This was a bug fix as it wasn't creating trackers anymore under circumstances. But totally fine to not merge