HBO’s “The Nevers” drops at a time when its existence will have to fight a more intense battle than anything on-screen against the stories about its creator, Joss Whedon. While the man behind “Buffy the Vampire Slayer,” “Angel,” and “Dollhouse” left the show in November as stories about his on-set behavior on “Justice League” were just starting to surface, his fingerprints are all over the four episodes of the new series. Fans of his work would know that this was either a show by Whedon or one heavily inspired by his breakthrough television.