(Credit: ©Gemma Escribano) The Wiener Staatsoper has announced cast changes for its productions of “Luisa Miller” and “Falstaff.” The company said that Marko Mimica will sing the role of Wurm, replacing Andrea Mastroni. It added that Attila Mokus will sing the role of Ford in “Falstaff,” replacing the originally announced Davide Luciano.  Mimica, who performs regularly throughout Europe at the Deutsche Oper {…}