Initialize new_message_count to 0 by default.
Initialize new_message_count to 0 by default.

860cf6871611bf0d4d4818f32d1f4835236d5c4d introduced calls to
notifications.redraw_title() on narrow activation.  This introduced a
bug when the Zulip desktop app reloads while narrowed --
new_message_count would still be set to undefined when
narrow.activate() is called as the page (re)loads, and thus we'd call
window.bridge.updateCount(undefined), resulting in a traceback.

We fix this by just initializing it to 0, rather than using the old
default value of undefined.

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