DALLAS — A pair of ruby slippers worn by Judy Garland in “The Wizard of Oz” is on the auction block nearly two decades after a thief stole the iconic shoes, convinced they were adorned with real jewels. Online bidding has started and will continue through December 7, Heritage Auctions in Dallas announced in a news release Monday. The auction company received the sequin-and-bead-bedazzled slippers from …