The Old 97s made their triumphant return to the 9:30 Club last night. Photo by Lisa Johnson. Our Nation’s Capitol has seen a lot more of the emancipated Rhett Miller in recent years than it has of his band, Old 97s. Miller may write most of the songs for the hard-charging country-pop-punkabilly quartet, but somehow he’s only about one–eleventh as interesting when he doesn’t have Murry Hammond singing harmony and Ken Bethea blasting out those…