Fix validator issue
Fix validator issue

Bringing no item caused the validator to break (which, of course,
made it nearly impossible to play gen 1).

I really wish full TypeScript coverage could come ASAP, so these
sorts of bugs would come less often.

sirDonovan/Pokemon-Showdown,Enigami/Pokemon-Showdown,Zarel/Pokemon-Showdown,xfix/Pokemon-Showdown,xCrystal/Pokemon-Showdown,AustinXII/Pokemon-Showdown,xCrystal/Pokemon-Showdown,panpawn/Gold-Server,Enigami/Pokemon-Showdown,Zarel/Pokemon-Showdown,ShowdownHelper/Saffron,danpantry/Pokemon-Showdown,HoeenCoder/SpacialGaze,urkerab/Pokemon-Showdown,ShowdownHelper/Saffron,AustinXII/Pokemon-Showdown,urkerab/Pokemon-Showdown,urkerab/Pokemon-Showdown,xfix/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,DesoGit/Tsunami_PS,svivian/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,DesoGit/Tsunami_PS,QuiteQuiet/Pokemon-Showdown,Zarel/Pokemon-Showdown,xfix/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,panpawn/Pokemon-Showdown,svivian/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,svivian/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,Enigami/Pokemon-Showdown,xCrystal/Pokemon-Showdown,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,danpantry/Pokemon-Showdown,panpawn/Gold-Server,svivian/Pokemon-Showdown,panpawn/Pokemon-Showdown,HoeenCoder/SpacialGaze,HoeenCoder/SpacialGaze,ShowdownHelper/Saffron,xfix/Pokemon-Showdown,DesoGit/Tsunami_PS,xfix/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,HoeenCoder/SpacialGaze,panpawn/Gold-Server