Add missing no-op migration for realm_emoji.
Add missing no-op migration for realm_emoji.

Because of how Django's migration system works, changing the error
message attached to a model field's validator results in an extra
migration.

grave-w-grave/zulip,hackerkid/zulip,hackerkid/zulip,amanharitsh123/zulip,zulip/zulip,Galexrt/zulip,TigorC/zulip,dawran6/zulip,dawran6/zulip,susansls/zulip,dhcrzf/zulip,isht3/zulip,zulip/zulip,vabs22/zulip,sharmaeklavya2/zulip,rishig/zulip,AZtheAsian/zulip,brainwane/zulip,brockwhittaker/zulip,joyhchen/zulip,grave-w-grave/zulip,ryanbackman/zulip,KingxBanana/zulip,jphilipsen05/zulip,mohsenSy/zulip,sonali0901/zulip,ryanbackman/zulip,zulip/zulip,tommyip/zulip,isht3/zulip,jrowan/zulip,amanharitsh123/zulip,synicalsyntax/zulip,j831/zulip,dhcrzf/zulip,synicalsyntax/zulip,eeshangarg/zulip,mahim97/zulip,paxapy/zulip,sonali0901/zulip,niftynei/zulip,vikas-parashar/zulip,JPJPJPOPOP/zulip,christi3k/zulip,samatdav/zulip,isht3/zulip,rht/zulip,Diptanshu8/zulip,Juanvulcano/zulip,jainayush975/zulip,christi3k/zulip,peguin40/zulip,reyha/zulip,showell/zulip,reyha/zulip,brockwhittaker/zulip,isht3/zulip,punchagan/zulip,paxapy/zulip,vabs22/zulip,hackerkid/zulip,rht/zulip,dattatreya303/zulip,dattatreya303/zulip,krtkmj/zulip,aakash-cr7/zulip,hackerkid/zulip,sup95/zulip,Juanvulcano/zulip,isht3/zulip,jainayush975/zulip,KingxBanana/zulip,tommyip/zulip,amanharitsh123/zulip,arpith/zulip,reyha/zulip,joyhchen/zulip,Diptanshu8/zulip,tommyip/zulip,mohsenSy/zulip,brockwhittaker/zulip,jainayush975/zulip,timabbott/zulip,arpith/zulip,sharmaeklavya2/zulip,PhilSk/zulip,dhcrzf/zulip,umkay/zulip,ahmadassaf/zulip,krtkmj/zulip,jrowan/zulip,sup95/zulip,dawran6/zulip,krtkmj/zulip,kou/zulip,tommyip/zulip,joyhchen/zulip,j831/zulip,dattatreya303/zulip,kou/zulip,punchagan/zulip,dawran6/zulip,sup95/zulip,jrowan/zulip,samatdav/zulip,vaidap/zulip,calvinleenyc/zulip,tommyip/zulip,Jianchun1/zulip,brainwane/zulip,jrowan/zulip,shubhamdhama/zulip,calvinleenyc/zulip,sonali0901/zulip,SmartPeople/zulip,jainayush975/zulip,sharmaeklavya2/zulip,vikas-parashar/zulip,susansls/zulip,souravbadami/zulip,jackrzhang/zulip,susansls/zulip,synicalsyntax/zulip,kou/zulip,krtkmj/zulip,synicalsyntax/zulip,ryanbackman/zulip,KingxBanana/zulip,PhilSk/zulip,umkay/zulip,vikas-parashar/zulip,calvinleenyc/zulip,niftynei/zulip,jainayush975/zulip,Galexrt/zulip,zacps/zulip,niftynei/zulip,punchagan/zulip,showell/zulip,dawran6/zulip,sonali0901/zulip,paxapy/zulip,aakash-cr7/zulip,ahmadassaf/zulip,hackerkid/zulip,Diptanshu8/zulip,amyliu345/zulip,cosmicAsymmetry/zulip,TigorC/zulip,vikas-parashar/zulip,christi3k/zulip,souravbadami/zulip,aakash-cr7/zulip,timabbott/zulip,souravbadami/zulip,Galexrt/zulip,amanharitsh123/zulip,JPJPJPOPOP/zulip,tommyip/zulip,rht/zulip,Galexrt/zulip,samatdav/zulip,peguin40/zulip,rishig/zulip,susansls/zulip,Galexrt/zulip,dawran6/zulip,zacps/zulip,jackrzhang/zulip,sup95/zulip,verma-varsha/zulip,kou/zulip,vabs22/zulip,zulip/zulip,Jianchun1/zulip,hackerkid/zulip,vabs22/zulip,paxapy/zulip,rishig/zulip,TigorC/zulip,blaze225/zulip,sharmaeklavya2/zulip,christi3k/zulip,Diptanshu8/zulip,mahim97/zulip,vabs22/zulip,showell/zulip,krtkmj/zulip,JPJPJPOPOP/zulip,samatdav/zulip,jackrzhang/zulip,Galexrt/zulip,Juanvulcano/zulip,joyhchen/zulip,jphilipsen05/zulip,eeshangarg/zulip,SmartPeople/zulip,umkay/zulip,showell/zulip,jackrzhang/zulip,Diptanshu8/zulip,shubhamdhama/zulip,shubhamdhama/zulip,j831/zulip,vaidap/zulip,andersk/zulip,zacps/zulip,andersk/zulip,cosmicAsymmetry/zulip,rishig/zulip,brainwane/zulip,eeshangarg/zulip,souravbadami/zulip,KingxBanana/zulip,timabbott/zulip,SmartPeople/zulip,peguin40/zulip,j831/zulip,umkay/zulip,susansls/zulip,mahim97/zulip,KingxBanana/zulip,ahmadassaf/zulip,andersk/zulip,Jianchun1/zulip,zacps/zulip,j831/zulip,timabbott/zulip,sup95/zulip,verma-varsha/zulip,PhilSk/zulip,ryanbackman/zulip,kou/zulip,andersk/zulip,AZtheAsian/zulip,Juanvulcano/zulip,AZtheAsian/zulip,aakash-cr7/zulip,AZtheAsian/zulip,synicalsyntax/zulip,vikas-parashar/zulip,christi3k/zulip,mohsenSy/zulip,verma-varsha/zulip,vaidap/zulip,sharmaeklavya2/zulip,AZtheAsian/zulip,mohsenSy/zulip,brockwhittaker/zulip,rishig/zulip,vikas-parashar/zulip,souravbadami/zulip,j831/zulip,andersk/zulip,peguin40/zulip,zulip/zulip,JPJPJPOPOP/zulip,kou/zulip,Jianchun1/zulip,zacps/zulip,joyhchen/zulip,grave-w-grave/zulip,blaze225/zulip,rishig/zulip,rishig/zulip,umkay/zulip,showell/zulip,sonali0901/zulip,niftynei/zulip,blaze225/zulip,mahim97/zulip,Juanvulcano/zulip,dhcrzf/zulip,dhcrzf/zulip,amanharitsh123/zulip,aakash-cr7/zulip,ahmadassaf/zulip,brockwhittaker/zulip,SmartPeople/zulip,ryanbackman/zulip,grave-w-grave/zulip,TigorC/zulip,arpith/zulip,susansls/zulip,blaze225/zulip,punchagan/zulip,grave-w-grave/zulip,Jianchun1/zulip,punchagan/zulip,amanharitsh123/zulip,ryanbackman/zulip,cosmicAsymmetry/zulip,andersk/zulip,vaidap/zulip,kou/zulip,aakash-cr7/zulip,verma-varsha/zulip,Juanvulcano/zulip,cosmicAsymmetry/zulip,eeshangarg/zulip,KingxBanana/zulip,showell/zulip,calvinleenyc/zulip,brainwane/zulip,PhilSk/zulip,andersk/zulip,jphilipsen05/zulip,arpith/zulip,dhcrzf/zulip,brainwane/zulip,rht/zulip,verma-varsha/zulip,Jianchun1/zulip,jphilipsen05/zulip,rht/zulip,calvinleenyc/zulip,joyhchen/zulip,SmartPeople/zulip,jrowan/zulip,brainwane/zulip,TigorC/zulip,christi3k/zulip,synicalsyntax/zulip,timabbott/zulip,jainayush975/zulip,TigorC/zulip,paxapy/zulip,grave-w-grave/zulip,arpith/zulip,niftynei/zulip,synicalsyntax/zulip,umkay/zulip,AZtheAsian/zulip,jackrzhang/zulip,zulip/zulip,ahmadassaf/zulip,zacps/zulip,souravbadami/zulip,cosmicAsymmetry/zulip,jackrzhang/zulip,shubhamdhama/zulip,calvinleenyc/zulip,tommyip/zulip,reyha/zulip,shubhamdhama/zulip,mahim97/zulip,SmartPeople/zulip,amyliu345/zulip,reyha/zulip,arpith/zulip,jrowan/zulip,Galexrt/zulip,krtkmj/zulip,cosmicAsymmetry/zulip,blaze225/zulip,verma-varsha/zulip,timabbott/zulip,punchagan/zulip,eeshangarg/zulip,eeshangarg/zulip,krtkmj/zulip,brainwane/zulip,amyliu345/zulip,amyliu345/zulip,PhilSk/zulip,dattatreya303/zulip,amyliu345/zulip,dhcrzf/zulip,shubhamdhama/zulip,peguin40/zulip,mohsenSy/zulip,zulip/zulip,showell/zulip,punchagan/zulip,samatdav/zulip,reyha/zulip,dattatreya303/zulip,vabs22/zulip,shubhamdhama/zulip,isht3/zulip,samatdav/zulip,rht/zulip,amyliu345/zulip,ahmadassaf/zulip,jphilipsen05/zulip,vaidap/zulip,brockwhittaker/zulip,rht/zulip,Diptanshu8/zulip,mahim97/zulip,dattatreya303/zulip,ahmadassaf/zulip,peguin40/zulip,umkay/zulip,timabbott/zulip,blaze225/zulip,jphilipsen05/zulip,mohsenSy/zulip,JPJPJPOPOP/zulip,sup95/zulip,JPJPJPOPOP/zulip,jackrzhang/zulip,sharmaeklavya2/zulip,vaidap/zulip,eeshangarg/zulip,niftynei/zulip,PhilSk/zulip,sonali0901/zulip,paxapy/zulip,hackerkid/zulip