The ultra-competitive market for online food delivery in Ireland has suffered a casualty with Marvin, which had been active for five years, shutting down.  In a notice sent to customers and restaurants, Marvin, which launched here in 2015, said it had ceased trading on September 18 and informed restaurants that all outstanding invoices would be paid. Marvin is part of the Hungry Group, a Danish food delivery company. According to a source familiar with Hungry and Marvin’s operations, the Irish business was profitable “on a small scale” but there was little appetite from the parent company to pursue the Irish…