I am always anxious to catch a new musical when it arrives on the Chicago stage.So I was disappointed not to be able to review “Queen of the Mist,” a recent production of Firebrand Theatre being performed at The Den, 1333 N. Milwaukee Ave., until just a few days before it closes on July 7.I am, however, able to report that it represents both what’s right and what’s wrong with new musicals today.It is …