Joy Behar is keeping mum about her hush-hush wedding to Steve Janowitz till she returns to “The View” Sept. 6. “I can’t say anything or Barbara [Walters] will kill me,” the comic was overheard joking when asked recently about the Aug. 11 ceremony. The ABC show is planning on revealing deets of Behar’s and Sherri Shepherd’s weddings when it starts its 15th season. Behar, meantime, was spotted having dinner Sunday night at Almond in Bridgehampton with Janowitz, her daughter, Eve, son-in-law and grandson. The day after her wedding, Behar coyly tweeted, “Gone fishing,” alluding to her keeping quiet till returning to work.