Jason Binn’s Boston Common magazine has apparently dropped any pretense it had of being of and about Boston. The new issue, which comes out next week, has actress Kate Walsh on the cover. And her local connection is? None. In an interview with Boston Common editor Janice O’Leary, Walsh, who stars on “Private Practice,’’ talks about her new fragrance - it’s called “Boyfriend’’ - and her favorite vacation destinations. Scintillating.