Photo courtesy KHOUGiff Nielsen, the sports anchor at KHOU who's been at the station 25 years, is leaving.And, ummm, there's not much to say because Nielsen might be the single most boring television personality in Houston history.Not that's a bad thing -- Nielsen capably delivered the news, conducted interviews and analyzed events -- but he did it utterly without shtick. Which, seeing how some clownishly some Houston sports achors have performed (Hellloooo, State Senator Dan Patrick!!) is proba