TV hasn’t been the same without Joss Whedon. But that will change soon. Whedon is returning to television with “Dollhouse,” a new sci-fi project starring “Buffy the Vampire Slayer” alumna Eliza Dushku. Fox has given “Dollhouse,” Whedon’s first TV series since “Firefly” (2002), a seven-episode commitment. “Dollhouse” has a compelling storyline. According to industry reports, Dushku plays Echo, a member of a group of men and women who are imprinted with different personalities for different assignments. In between tasks they are mind-wiped, living like children in Dollhouse, a futuristic dorm/lab. They have no memories of their previous lives, until E