... sounds like a non-story. Reigning world champion Mark Cavendish missed an out-of-competition control last April because he was filming something on Mt. Etna with the BBC, instead of wherever he had told the test/tracking system where he would be. He calls it an "administrative error" and since it's his first, he has two more strikes before there could be repercussions. There is no other evidence of Cavendish being involved in anything resembling cheating.
Anytime a sentence includes "world champion" and "doping" there will be news, and to make matters worse the story coincides with two other riders' control-availability situations which point to real trouble. But for Cav, this is one of those rare occasions where, from all appearances, there really is no news.