Disney’s ABC has tossed unseen episodes of “Wicked City” onto Hulu’s streaming-video service, after it cut the serial-killer drama with ratings that plumbed historic lows. The fourth through seventh episodes, which were already shot when ABC pulled the show from its lineup in November, were available to watch on Hulu Wednesday. The eighth, final episode is expected to join the others later, but there has been no suggestion that Hulu will produce any additional episodes. It follows a budding practice among streaming-video services of reviving traditional television shows that were canceled by their networks, but with a twist.