Error better when handlebars template is missing (#1338)
Error better when handlebars template is missing (#1338)

Currently if you try to use a non-existent handlebars
template, you get this error:

Uncaught TypeError: Handlebars.templates[name] is not a function

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