Improve branch test coverage for html_tag_tree() in template parser.
Improve branch test coverage for html_tag_tree() in template parser.

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