When you look at this photograph of the chefs who participated in the 2012 Taste of WGBH Food & Wine Festival, you have to wonder . . . were all of Boston’s restaurant kitchens empty on Thursday night? The chefs, who cooked up treats for 400 guests at WGBH’s studios on Thursday, are Rich Garcia (606 Congress), Sean Lizotte (Henrietta’s Table), Frank McClelland (L'Espalier), Robert Sisca (Bistro du Midi), Nicole Coady (Finale), Michael Leviton (Lumiere), Judy Mattera (Sweet Solutions), Tripp Nichols (Formaggio's Kitchen), Julia Hallman (Formaggio's Kitchen), Mark Sapienza (Café Fleuri), Andy Husbands (Tremont 647), Paul Capecchi (Taranta), Jasper White (Summer Shack), Susan Regis (UpStairs on the Square), Dante de Magistris (il Casale), Jose Duarte (Taranta), Jed Hackney (Café Fleuri), Aaron Depaolo (Blue Ginger), William Kovel (Catalyst), Jeremy Sewall (Lineage), Jody Adams (Rialto), and Lydia Shire (Scampo).