Fix crash in /hidetext
Fix crash in /hidetext

`getLastIdOf()` crashes on a `null` user object (user not found)
kotarou3/Krister-Pokemon-Showdown,Lord-Haji/SpacialGaze,jumbowhales/Pokemon-Showdown,Enigami/Pokemon-Showdown,Volcos/SpacialGaze,hayleysworld/serenityserver,xfix/Pokemon-Showdown,gustavo515/final,scotchkorean27/Pokemon-Showdown,Wando94/Pokemon-Showdown,yashagl/pokemon-showdown,scotchkorean27/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,Enigami/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,KaitoV4X/Showdown,Lauc1an/Perulink-Showdown,Alpha-Devs/OmegaRuby-Server,panpawn/Gold-Server,SkyeTheFemaleSylveon/Pokemon-Showdown,panpawn/Pokemon-Showdown,TheManwithskills/Dusk--Showdown,Zarel/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,CreaturePhil/Showdown-Boilerplate,xCrystal/Pokemon-Showdown,lAlejandro22/lolipoop,hayleysworld/serenity,Ecuacion/Lumen-Pokemon-Showdown,azum4roll/Pokemon-Showdown,Irraquated/Pokemon-Showdown,Nineage/Origin,Firestatics/omega,Flareninja/Pokemon-Showdown,PS-Spectral/Spectral,danpantry/Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,Wando94/Spite,HoeenCoder/SpacialGaze,yashagl/yash-showdown,Ecuacion/Lumen-Pokemon-Showdown,Mystifi/Exiled,HoeenCoder/SpacialGaze,ZeroParadox/ugh,Guernouille/Pokemon-Showdown,bai2/Dropp,gustavo515/test,Pikachuun/Pokemon-Showdown,Lauc1an/Perulink-Showdown,TheManwithskills/DS,DesoGit/TsunamiPS,javi501/Lumen-Pokemon-Showdown,Syurra/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,ZestOfLife/FestiveLife,SolarisFox/Pokemon-Showdown,DesoGit/Tsunami_PS,AustinXII/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Sora-League/Sora,ZeroParadox/BlastBurners,Vacate/Pokemon-Showdown,Elveman/RPCShowdownServer,DB898/theregalias,DarkSuicune/Pokemon-Showdown,Volcos/SpacialGaze,KewlStatics/Showdown-Template,Firestatics/Firestatics46,kuroscafe/Paradox,xfix/Pokemon-Showdown,panpawn/Gold-Server,cadaeic/Pokemon-Showdown,xCrystal/Pokemon-Showdown,DesoGit/Tsunami_PS,Mystifi/Exiled,Ecuacion/Pokemon-Showdown,KewlStatics/Pokeindia-Codes,MeliodasBH/Articuno-Land,piiiikachuuu/Pokemon-Showdown,Firestatics/Omega-Alpha,svivian/Pokemon-Showdown,arkanox/MistShowdown,CreaturePhil/Showdown-Boilerplate,lAlejandro22/lolipoop,xCrystal/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,kuroscafe/Showdown-Boilerplate,gustavo515/batata,bai2/Dropp,DesoGit/TsunamiPS,MeliodasBH/boarhat,Enigami/Pokemon-Showdown,Sora-League/Sora,Git-Worm/City-PS,HoeenCoder/SpacialGaze,svivian/Pokemon-Showdown,Lord-Haji/SpacialGaze,Kevinxzllz/PS-Openshift-Server,sirDonovan/Pokemon-Showdown,Syurra/Pokemon-Showdown,svivian/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,Irraquated/Pokemon-Showdown,TheFenderStory/Showdown-Boilerplate,Pikachuun/Pokemon-Showdown-SMCMDM,Nineage/Origin,KewlStatics/Alliance,Bryan-0/Pokemon-Showdown,MeliodasBH/boarhat,gustavo515/final,SSJGVegito007/Vegito-s-Server,Enigami/Pokemon-Showdown,Elveman/RPCShowdownServer,TheManwithskills/DS,TheManwithskills/serenity,TheManwithskills/Creature-phil-boiler,QuiteQuiet/Pokemon-Showdown,KewlStatics/Pokeindia-Codes,Zarel/Pokemon-Showdown,Firestatics/omega,urkerab/Pokemon-Showdown,Mystifi/Exiled,CharizardtheFireMage/Showdown-Boilerplate,AbsolitoSweep/Absol-server,BlazingAura/Showdown-Boilerplate,JennyPRO/Jenny,panpawn/Gold-Server,danpantry/Pokemon-Showdown,Git-Worm/City-PS,kuroscafe/Showdown-Boilerplate,cadaeic/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,ScottehMax/Pokemon-Showdown,Alpha-Devs/Alpha-Server,lFernanl/Lumen-Pokemon-Showdown,xfix/Pokemon-Showdown,KewlStatics/Shit,CreaturePhil/Showdown-Boilerplate,Kevinxzllz/PS-Openshift-Server,ShowdownHelper/Saffron,hayleysworld/serenityserver,yashagl/pokemon-showdown,ZeroParadox/ugh,ScottehMax/Pokemon-Showdown,Wando94/Spite,AbsolitoSweep/Absol-server,kotarou3/Krister-Pokemon-Showdown,KewlStatics/Alliance,AWailOfATail/awoat,kuroscafe/Paradox,AWailOfATail/awoat,Hidden-Mia/Roleplay-PS,zek7rom/SpacialGaze,urkerab/Pokemon-Showdown,Flareninja/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,azum4roll/Pokemon-Showdown,ZestOfLife/PSserver,gustavo515/batata,ehk12/coregit,QuiteQuiet/Pokemon-Showdown,ShowdownHelper/Saffron,Sora-League/Sora,DB898/theregalias,SkyeTheFemaleSylveon/Pokemon-Showdown,Pablo000/aaa,Ecuacion/Pokemon-Showdown,TheManwithskills/Dusk--Showdown,panpawn/Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,theodelhay/test,Kokonoe-san/Glacia-PS,AnaRitaTorres/Pokemon-Showdown,ZestOfLife/FestiveLife,Flareninja/Showdown-Boilerplate,CharizardtheFireMage/Showdown-Boilerplate,SSJGVegito007/Vegito-s-Server,aakashrajput/Pokemon-Showdown,Vacate/Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,ehk12/coregit,ehk12/bigbangtempclone,Alpha-Devs/Alpha-Server,jd4564/Pokemon-Showdown,yashagl/yash-showdown,TheManwithskills/COC,ShowdownHelper/Saffron,aakashrajput/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,KaitoV4X/Showdown,hayleysworld/serenityc9,DesoGit/Tsunami_PS,aakashrajput/Pokemon-Showdown,KewlStatics/Shit,ZeroParadox/BlastBurners,Pablo000/aaa,DarkSuicune/Pokemon-Showdown,PS-Spectral/Spectral,Kokonoe-san/Glacia-PS,arkanox/MistShowdown,psnsVGC/Wish-Server,TbirdClanWish/Pokemon-Showdown,Firestatics/Firestatics46,Alpha-Devs/OmegaRuby-Server,ehk12/bigbangtempclone,Wando94/Pokemon-Showdown,Firestatics/Omega-Alpha,zek7rom/SpacialGaze,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,hayleysworld/serenityc9,sirDonovan/Pokemon-Showdown,TheFenderStory/Showdown-Boilerplate,EienSeiryuu/Pokemon-Showdown,TheManwithskills/serenity,AWailOfATail/Pokemon-Showdown,KewlStatics/Showdown-Template,theodelhay/test,svivian/Pokemon-Showdown,lFernanl/Lumen-Pokemon-Showdown,ZestOfLife/PSserver,jd4564/Pokemon-Showdown,PS-Spectral/Spectral,TheManwithskills/COC,xfix/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,HoeenCoder/SpacialGaze,TheManwithskills/Creature-phil-boiler,Irraquated/Pokemon-Showdown,MeliodasBH/Articuno-Land,AWailOfATail/Pokemon-Showdown,javi501/Lumen-Pokemon-Showdown,psnsVGC/Wish-Server,gustavo515/test,hayleysworld/serenity,JennyPRO/Jenny,Lord-Haji/SpacialGaze,svivian/Pokemon-Showdown,urkerab/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,Guernouille/Pokemon-Showdown,Pikachuun/Pokemon-Showdown-SMCMDM,AustinXII/Pokemon-Showdown