Warner Home Video recently released the inert musical “Lucky Me,” one of Doris Day’s few flops, and this trend goes back as far as the ironically titled “Lucky Night,” which introduced the less-than-scintillating team of Robert Taylor and Myrna Loy, who arguably had even less chemistry together than Barrymore and Bana. And, while we’re at it, isn’t it time for a moratorium on movies set in Las Vegas? It’s so tapped out as a metaphor for American ennui that it’s become a huge cliche. The Vegas-set “Lucky You” follows the Nicolas Cage bomb “Next,” which is his something like the star’s fourth film set in Sin City (if you count the climax of “Con Air”) and will be followed shortly by “Ocean’s Thirteen.” We recently caught a trailer for the next “Resident Evil” flick, and that one seems to be set in Vegas too, albeit a post-Apocalyptic version.