Fix crash in verifier.js
Fix crash in verifier.js

This prevents the verifier process from crashing if the signature
is not a valid hex string.

MayukhKundu/Technogear,piiiikachuuu/Pokemon-Showdown,Ransei1/Alt,TheManwithskills/Server---Thermal,KaitoV4X/Showdown,Pikachuun/Pokemon-Showdown,SerperiorBae/Bae-Showdown-2,theodelhay/test,TheFenderStory/Pokemon-Showdown,cadaeic/Pokemon-Showdown,MayukhKundu/Technogear-Final,comedianchameleon/servertest1,AWailOfATail/Pokemon-Showdown,Yggdrasil-League/Yggdrasil,Luobata/Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,Pikachuun/Pokemon-Showdown-SMCMDM,Legit99/Lightning-Storm-Server,hayleysworld/Showdown-Boilerplate,Flareninja/Hispano-Pokemon-Showdown,TheManwithskills/Creature-phil-boiler,hayleysworld/Pokemon-Showdown,hayleysworld/asdfasdf,forbiddennightmare/Pokemon-Showdown-1,SkyeTheFemaleSylveon/Mudkip-Server,MayukhKundu/Flame-Savior,Chespin14/Custom-Platform-Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Ecuacion/Lumen-Pokemon-Showdown,Wando94/Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,Flareninja/Sora,Kill-The-Noise/BlakJack-Boilerplate,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,sama2/Dropp-Pokemon-Showdown,Elveman/RPCShowdownServer,Flareninja/Sora,AustinXII/Pokemon-Showdown,xfix/Pokemon-Showdown,JellalTheMage/Jellals-Server,SilverTactic/Pokemon-Showdown,Neosweiss/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,LightningStormServer/Lightning-Storm,kuroscafe/Paradox,aakashrajput/Pokemon-Showdown,ankailou/Pokemon-Showdown,LustyAsh/EOS-Master,Enigami/Pokemon-Showdown,KewlStatics/Alliance,DesoGit/TsunamiPS,Enigami/Pokemon-Showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,Volcos/SpacialGaze,javi501/Lumen-Pokemon-Showdown,Nineage/Origin,kupochu/Pokemon-Showdown,urkerab/Pokemon-Showdown,superman8900/Pokemon-Showdown,SkyeTheFemaleSylveon/Pokemon-Showdown,Tesarand/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,panpawn/Gold-Server,Kevinxzllz/PS-Openshift-Server,yashagl/pokemon,TheManwithskills/Server,cadaeic/Pokemon-Showdown,Alpha-Devs/Alpha-Server,Irraquated/Showdown-Boilerplate,TheManwithskills/Dusk--Showdown,Irraquated/EOS-Master,forbiddennightmare/Pokemon-Showdown-1,Sora-Server/Sora,Lord-Haji/SpacialGaze,ZestOfLife/PSserver,Alpha-Devs/Alpha-Server,Extradeath/advanced,JellalTheMage/PS-,Enigami/Pokemon-Showdown,Psyientist/Showdown-Boilerplate,TbirdClanWish/Pokemon-Showdown,hayleysworld/asdfasdf,svivian/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,megaslowbro1/Pokemon-Showdown,anubhabsen/Pokemon-Showdown,Irraquated/EOS-Master,zczd/enculer,Zarel/Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,Gold-Solox/Pokemon-Showdown,panpawn/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown-1,SilverTactic/Pokemon-Showdown,xfix/Pokemon-Showdown,xCrystal/Pokemon-Showdown,MayukhKundu/Mudkip-Server,lFernanl/Zero-Pokemon-Showdown,SerperiorBae/Bae-Showdown,PS-Spectral/Spectral,KewlStatics/Shit,SkyeTheFemaleSylveon/Pokemon-Showdown,MayukhKundu/Pokemon-Domain,Firestatics/omega,Ridukuo/Test,Tesarand/Pokemon-Showdown,Ecuacion/Lumen-Pokemon-Showdown,Parukia/Pokemon-Showdown,Syurra/Pokemon-Showdown,Lord-Haji/SpacialGaze,AWailOfATail/Pokemon-Showdown,EmmaKitty/Pokemon-Showdown,PrimalGallade45/Lumen-Pokemon-Showdown,SSJGVegito007/Vegito-s-Server,ZeroParadox/BlastBurners,Mystifi/Exiled,ScottehMax/Pokemon-Showdown,LightningStormServer/Lightning-Storm,PrimalGallade45/Dropp-Pokemon-Showdown,asdfghjklohhnhn/Pokemon-Showdown,SubZeroo99/Pokemon-Showdown,urkerab/Pokemon-Showdown,arkanox/MistShowdown,Atwar/server-epilogueleague.rhcloud.com,yashagl/pokemon-showdown,urkerab/Pokemon-Showdown,KewlStatics/Showdown-Template,DB898/theregalias,hayleysworld/serenityc9,DesoGit/Tsunami_PS,Pablo000/aaa,comedianchameleon/servertest1,CreaturePhil/Showdown-Boilerplate,TheManwithskills/New-boiler-test,TheManwithskills/Server,Zipzapadam/Server,Guernouille/Pokemon-Showdown,Extradeath/advanced,DarkSuicune/Kakuja-2.0,Raina4uberz/Light-server,SerperiorBae/BaeShowdown,yashagl/yash-showdown,hayleysworld/serenityc9,jumbowhales/Pokemon-Showdown,Legit99/Lightning-Storm-Server,asdfghjklohhnhn/Pokemon-Showdown,HoeenCoder/SpacialGaze,InvalidDN/Pokemon-Showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,Hopenub/Pokemon-Showdown,Disaster-Area/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,gustavo515/batata,TheFenderStory/Showdown-Boilerplate,KaitoV4X/Showdown,MayukhKundu/Flame-Savior,Extradeath/psserver,SubZeroo99/Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,BadSteel/Pokemon-Showdown,ZeroParadox/BlastBurners,lAlejandro22/lolipoop,Adithya4Uberz/The-Tsunami-League,AustinXII/Pokemon-Showdown,jd4564/Pokemon-Showdown,BuzzyOG/Pokemon-Showdown,FakeSloth/Infinite,MayukhKundu/Technogear,PS-Spectral/Spectral,kuroscafe/Paradox,xfix/Pokemon-Showdown,RustServer/Pokemon-Showdown,MayukhKundu/Technogear-Final,PauLucario/LQP-Server-Showdown,Kokonoe-san/Glacia-PS,SerperiorBae/Bae-Showdown,Irraquated/Pokemon-Showdown,Ecuacion/Pokemon-Showdown,ehk12/bigbangtempclone,Lauc1an/Perulink-Showdown,Pikachuun/Joimmon-Showdown,sama2/Dropp-Pokemon-Showdown,catanatron/pokemon-rebalance,svivian/Pokemon-Showdown,Flareninja/Pokemon-Showdown,MeliodasBH/Articuno-Land,DesoGit/TsunamiPS,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,Pokemon-Devs/Pokemon-Showdown,Tesarand/Pokemon-Showdown,Pikachuun/Touhoumon-Showdown,xCrystal/Pokemon-Showdown,MasterFloat/LQP-Server-Showdown,kubetz/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,azum4roll/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,MasterFloat/LQP-Server-Showdown,lFernanl/Zero-Pokemon-Showdown,MayukhKundu/Pokemon-Domain,Flareninja/Hispano-Pokemon-Showdown,catanatron/pokemon-rebalance,JellalTheMage/PS-,xCrystal/Pokemon-Showdown,gustavo515/batata,Checkinator/Pokemon-Showdown,SerperiorBae/BaeShowdown,TheFenderStory/Showdown-Boilerplate,abulechu/Lumen-Pokemon-Showdown,panpawn/Gold-Server,MasterFloat/Pokemon-Showdown,Sora-Server/Sora,TheManwithskills/New-boiler-test,AustinXII/Pokemon-Showdown,Oiawesome/DPPtServ2,johtooo/PS,DalleTest/Pokemon-Showdown,Yggdrasil-League/Yggdrasil,UniversalMan12/Universe-Server,InvalidDN/Pokemon-Showdown,Wando94/Spite,ZestOfLife/FestiveLife,bai2/Dropp,sama2/Lumen-Pokemon-Showdown,CreaturePhil/Pokemon-Showdown,hayleysworld/serenity,abrulochp/Dropp-Pokemon-Showdown,BuzzyOG/Pokemon-Showdown,MasterFloat/Pokemon-Showdown,DesoGit/Tsunami_PS,LegendBorned/PS-Boilerplate,Thiediev/Pokemon-Showdown,abrulochp/Lumen-Pokemon-Showdown,zek7rom/SpacialGaze,DarkSuicune/Pokemon-Showdown,Ridukuo/Test2,HoeenKid/Pokemon-Showdown-Johto,Atwar/ServerClassroom,SerperiorBae/Pokemon-Showdown-1,Oiawesome/DPPtServ2,hayleysworld/harmonia,Breakfastqueen/advanced,gustavo515/gashoro,Flareninja/Lumen-Pokemon-Showdown,comedianchameleon/test,sama2/Universe-Pokemon-Showdown,miahjennatills/Pokemon-Showdown,FakeSloth/wulu,Irraquated/Pokemon-Showdown,Evil-kun/Pokemon-Showdown,megaslowbro1/Pokemon-Showdown,Kevinxzllz/PS-Openshift-Server,Bryan-0/Pokemon-Showdown,Ridukuo/Test2,scotchkorean27/Pokemon-Showdown,Zarel/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,QuiteQuiet/Pokemon-Showdown,SerperiorBae/PokemonShowdown2,Pikachuun/Pokemon-Showdown,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,DesoGit/Tsunami_PS,Enigami/Pokemon-Showdown,zczd/enculer,AvinashSwaminathan/lotus-v2,EienSeiryuu/Pokemon-Showdown,ehk12/clone,Psyientist/Showdown-Boilerplate,Flareninja/Showdown-Boilerplate,QuiteQuiet/Pokemon-Showdown,Firestatics/Firestatics46,SerperiorBae/Pokemon-Showdown,brettjbush/Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,Stroke123/POKEMON,jd4564/Pokemon-Showdown,KewlStatics/Pokeindia-Codes,SolarisFox/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,abulechu/Lumen-Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,Raina4uberz/Light-server,TheManwithskills/Server---Thermal,Sora-League/Sora,SerperiorBae/Bae-Showdown,ShowdownHelper/Saffron,hayleysworld/serenityserver,AbsolitoSweep/Absol-server,PrimalGallade45/Dropp-Pokemon-Showdown,AbsolitoSweep/Absol-server,Wando94/Spite,anubhabsen/Pokemon-Showdown,SerperiorBae/PokemonShowdown2,QuiteQuiet/Pokemon-Showdown,zek7rom/SpacialGaze,SSJGVegito007/Vegito-s-Server,Irraquated/Pokemon-Showdown,TheManwithskills/Server-2,danpantry/Pokemon-Showdown,MeliodasBH/boarhat,SilverTactic/Showdown-Boilerplate,danpantry/Pokemon-Showdown,gustavo515/final,KewlStatics/Showdown-Template,AvinashSwaminathan/lotus-v3,Firestatics/Firestatics46,azum4roll/Pokemon-Showdown,SerperiorBae/Bae-Showdown-2,Darkshadow6/PokeMoon-Creation,sirDonovan/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,panpawn/Gold-Server,Lord-Haji/SpacialGaze,Wando94/Pokemon-Showdown,Nineage/Origin,DalleTest/Pokemon-Showdown,hayleysworld/serenityserver,FakeSloth/Infinite,DarkSuicune/Kakuja-2.0,Pablo000/aaa,CorruptedHelix/Pokemon-Showdown,Flareninja/Pokemon-Showdown-1,SilverTactic/Dragotica-Pokemon-Showdown,scotchkorean27/Pokemon-Showdown,ZestOfLife/PSserver,kubetz/Pokemon-Showdown,TheDiabolicGift/Showdown-Boilerplate,Kill-The-Noise/BlakJack-Boilerplate,kupochu/Pokemon-Showdown,TheManwithskills/Server-2,BadSteel/Omega-Pokemon-Showdown,comedianchameleon/test,johtooo/PS,HoeenCoder/SpacialGaze,SerperiorBae/BaeShowdown,Lauc1an/Perulink-Showdown,ShowdownHelper/Saffron,SerperiorBae/Bae-Showdown-2,gustavo515/test,TheManwithskills/Creature-phil-boiler,Kenny-/Pokemon-Showdown,LustyAsh/EOS-Master,VoltStorm/Server-pokemon-showdown,Firestatics/Omega-Alpha,lFernanl/Lumen-Pokemon-Showdown,Stroke123/POKEMON,ehk12/coregit,Breakfastqueen/advanced,xfix/Pokemon-Showdown,yashagl/yash-showdown,Darkshadow6/PokeMoon-Creation,Alpha-Devs/OmegaRuby-Server,kotarou3/Krister-Pokemon-Showdown,Zarel/Pokemon-Showdown,Neosweiss/Pokemon-Showdown,yashagl/pokecommunity,Sora-Server/Sora,arkanox/MistShowdown,KewlStatics/Pokeindia-Codes,EmmaKitty/Pokemon-Showdown,Fusxfaranto/Pokemon-Showdown,iFaZe/SilverZ,SilverTactic/Showdown-Boilerplate,PS-Spectral/Spectral,Articuno-I/Pokemon-Showdown,SkyeTheFemaleSylveon/Mudkip-Server,KewlStatics/Alliance,Legendaryhades/Oblivion,sama2/Viridian-Pokemon-Showdown,SerperiorBae/Pokemon-Showdown,AWailOfATail/awoat,AWailOfATail/awoat,lFernanl/Pokemon-Showdown,ZeroParadox/ugh,TheManwithskills/COC,Nineage/Showdown-Boilerplate,iFaZe/SliverX,ZestOfLife/FestiveLife,Checkinator/Pokemon-Showdown,TheManwithskills/serenity,Gold-Solox/Pokemon-Showdown,Volcos/SpacialGaze,Pokemon-Devs/Pokemon-Showdown,gustavo515/final,Git-Worm/City-PS,CrestfallPS/Pokemon-Showdown,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,sirDonovan/Pokemon-Showdown,hayleysworld/Pokemon-Showdown,Johto-Serverr/Werfin-Boilerplate,MeliodasBH/boarhat,Firestatics/omega,SerperiorBae/Pokemon-Showdown-1,JellalTheMage/Jellals-Server,Kill-The-Noise/BlakJack-Boilerplate,svivian/Pokemon-Showdown,kuroscafe/Showdown-Boilerplate,gustavo515/gashoro,Elveman/RPCShowdownServer,Flareninja/Pokemon-Showdown,Parukia/Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,Ridukuo/Test,TogeSR/Lumen-Pokemon-Showdown,NoahVSGamingYT/Pokemon-Showdown,PrimalGallade45/Lumen-Pokemon-Showdown,TheManwithskills/Dusk--Showdown,RustServer/Pokemon-Showdown,Pikachuun/Joimmon-Showdown,BuzzyOG/Pokemon-Showdown,psnsVGC/Wish-Server,CharizardtheFireMage/Showdown-Boilerplate,lAlejandro22/lolipoop,TheDiabolicGift/Showdown-Boilerplate,BlazingAura/Showdown-Boilerplate,Vacate/Pokemon-Showdown,SilverTactic/Dragotica-Pokemon-Showdown,ScottehMax/Pokemon-Showdown,gustavo515/test,Atwar/ServerClassroom,aakashrajput/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,Flareninja/Sora,lFernanl/Pokemon-Showdown,Mystifi/Exiled,TheManwithskills/DS,Git-Worm/City-PS,BlakJack/Kill-The-Noise,Adithya4Uberz/KTN,AvinashSwaminathan/lotus,ShowdownHelper/Saffron,kotarou3/Krister-Pokemon-Showdown,sama2/Viridian-Pokemon-Showdown,svivian/Pokemon-Showdown,kuroscafe/Showdown-Boilerplate,SolarisFox/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,UniversalMan12/Universe-Server,megaslowbro1/Showdown-Server-again,xfix/Pokemon-Showdown,panpawn/Pokemon-Showdown,k3naan/Pokemon-Showdown,Atwar/server-epilogueleague.rhcloud.com,TogeSR/Lumen-Pokemon-Showdown,AvinashSwaminathan/Pokelegends,EienSeiryuu/Pokemon-Showdown,NoahVSGamingYT/Pokemon-Showdown,ehk12/clone,Sora-League/Sora,Ransei1/Alt,TheManwithskills/serenity,yashagl/pokecommunity,brettjbush/Pokemon-Showdown,Articuno-I/Pokemon-Showdown,Celecitia/Plux-Pokemon-Showdown,abrulochp/Lumen-Pokemon-Showdown,sama2/Lumen-Pokemon-Showdown,Pikachuun/Pokemon-Showdown-SMCMDM,Syurra/Pokemon-Showdown,superman8900/Pokemon-Showdown,lFernanl/Lumen-Pokemon-Showdown,lFernanl/Mudkip-Server,TheManwithskills/COC,bai2/Dropp,DB898/theregalias,Firestatics/Omega-Alpha,Guernouille/Pokemon-Showdown,MeliodasBH/Articuno-Land,ehk12/coregit,ZeroParadox/ugh,Mystifi/Exiled,UniversalMan12/Universe-Server,javi501/Lumen-Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,hayleysworld/Showdown-Boilerplate,Celecitia/Plux-Pokemon-Showdown,ankailou/Pokemon-Showdown,hayleysworld/harmonia,hayleysworld/serenity,CreaturePhil/Showdown-Boilerplate,HoeenCoder/SpacialGaze,HoeenCoder/SpacialGaze,Adithya4Uberz/The-Tsunami-League,Zipzapadam/Server,BasedGod7/PH,Werfin96/Ultimate,PauLucario/LQP-Server-Showdown,k3naan/Pokemon-Showdown,Arcticblast/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,svivian/Pokemon-Showdown,LightningStormServer/Lightning-Storm,Breakfastqueen/advanced,TheManwithskills/Server-2,Extradeath/psserver,LegendBorned/PS-Boilerplate,theodelhay/test,Irraquated/Showdown-Boilerplate,Flareninja/Pokemon-Showdown-1,TheManwithskills/DS,sirDonovan/Pokemon-Showdown,Sora-League/Sora,miahjennatills/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,CreaturePhil/Pokemon-Showdown,psnsVGC/Wish-Server,Parukia/Pokemon-Showdown,ehk12/bigbangtempclone,Vacate/Pokemon-Showdown,abrulochp/Dropp-Pokemon-Showdown,KewlStatics/Shit,Kokonoe-san/Glacia-PS,Disaster-Area/Pokemon-Showdown,CorruptedHelix/Pokemon-Showdown,JennyPRO/Jenny,lFernanl/Mudkip-Server,JennyPRO/Jenny,megaslowbro1/Showdown-Server-again,Evil-kun/Pokemon-Showdown,yashagl/pokemon,sama2/Universe-Pokemon-Showdown,yashagl/pokemon-showdown,comedianchameleon/test,SerperiorBae/Pokemon-Showdown,MayukhKundu/Mudkip-Server,Darkshadow6/PokeMoon-Creation,Ecuacion/Pokemon-Showdown