Ezra Klein reports, via the Internet Food Association, that last night, Tom Colicchio (he of Top Chef and craftsteak) swooped to the rescue of cookbook author Joan Nathan, performing the Heimlich Maneuver at a much-needed moment. The big save happened at a benefit for D.C. Central Kitchen and Martha’s Table, where luminaries of the food world milled about and showed off their skills. Colicchio was modest, Klein reports. ““I just happened to be nearby,”…