A former 7-Eleven that is now vacant, at 4116 N. Clark St. in Lake View, may become the next location for Access Contemporary Music’s school and venue.Pat Nabong/Sun-Times Seth Boustead said he's seen the former 7-Eleven storefront at 4116 N. Clark St. sit empty for ages.But now the executive director of Access Contemporary Music wants to breathe new life into the vacant Lake View property with plans to create a space for music performances and…