Poster Boy dodges jail on judge's goof By ALEX GINSBERG NYPOST The subway vandal known as Poster Boy just barely dodged jail yesterday, thanks to an oversight by the judge sentencing him. But Henry Matyjewicz, 28, was AWOL from court and never heard the news. The "artist" -- who slices up subway ads -- had negotiated a probation deal with the DA late last year, a promise that evaporated when he was rearrested shortly after he pleaded guilty. Furious prosecutors asked Justice Michael Gary to revoke the deal and impose a jail sentence. http://www.flickr.com/photos/26296445@N05/2872279732/