Fix JS error syncing starred out-of-view messages.
Fix JS error syncing starred out-of-view messages.

Previously, if one starred very old messages (or ones in a stream
you're not subscribed to), your other open browsers would likely throw
an exception syncing the message flag.

andersk/zulip,susansls/zulip,SmartPeople/zulip,andersk/zulip,punchagan/zulip,sharmaeklavya2/zulip,SmartPeople/zulip,dattatreya303/zulip,rht/zulip,brainwane/zulip,j831/zulip,rht/zulip,rishig/zulip,kou/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,synicalsyntax/zulip,andersk/zulip,sonali0901/zulip,susansls/zulip,rishig/zulip,jackrzhang/zulip,showell/zulip,jackrzhang/zulip,j831/zulip,eeshangarg/zulip,aakash-cr7/zulip,tommyip/zulip,samatdav/zulip,ryanbackman/zulip,showell/zulip,timabbott/zulip,dhcrzf/zulip,amanharitsh123/zulip,rht/zulip,brainwane/zulip,jphilipsen05/zulip,j831/zulip,timabbott/zulip,tommyip/zulip,tommyip/zulip,brainwane/zulip,j831/zulip,showell/zulip,vabs22/zulip,rht/zulip,dawran6/zulip,isht3/zulip,timabbott/zulip,Galexrt/zulip,jphilipsen05/zulip,PhilSk/zulip,vaidap/zulip,blaze225/zulip,zulip/zulip,andersk/zulip,vaidap/zulip,rishig/zulip,aakash-cr7/zulip,synicalsyntax/zulip,eeshangarg/zulip,punchagan/zulip,PhilSk/zulip,jainayush975/zulip,punchagan/zulip,samatdav/zulip,amanharitsh123/zulip,eeshangarg/zulip,Galexrt/zulip,dattatreya303/zulip,jainayush975/zulip,j831/zulip,shubhamdhama/zulip,souravbadami/zulip,jainayush975/zulip,mahim97/zulip,jrowan/zulip,jainayush975/zulip,jackrzhang/zulip,samatdav/zulip,punchagan/zulip,SmartPeople/zulip,JPJPJPOPOP/zulip,jphilipsen05/zulip,vaidap/zulip,vabs22/zulip,hackerkid/zulip,vaidap/zulip,hackerkid/zulip,rht/zulip,jrowan/zulip,amanharitsh123/zulip,dawran6/zulip,PhilSk/zulip,blaze225/zulip,samatdav/zulip,susansls/zulip,punchagan/zulip,jphilipsen05/zulip,amanharitsh123/zulip,christi3k/zulip,jackrzhang/zulip,dawran6/zulip,isht3/zulip,aakash-cr7/zulip,SmartPeople/zulip,hackerkid/zulip,Galexrt/zulip,eeshangarg/zulip,Galexrt/zulip,shubhamdhama/zulip,showell/zulip,brockwhittaker/zulip,jrowan/zulip,brockwhittaker/zulip,synicalsyntax/zulip,jrowan/zulip,brockwhittaker/zulip,zulip/zulip,christi3k/zulip,dawran6/zulip,Galexrt/zulip,rishig/zulip,eeshangarg/zulip,susansls/zulip,isht3/zulip,sharmaeklavya2/zulip,dhcrzf/zulip,synicalsyntax/zulip,sonali0901/zulip,blaze225/zulip,aakash-cr7/zulip,andersk/zulip,timabbott/zulip,christi3k/zulip,brainwane/zulip,verma-varsha/zulip,vaidap/zulip,jphilipsen05/zulip,verma-varsha/zulip,verma-varsha/zulip,samatdav/zulip,JPJPJPOPOP/zulip,Galexrt/zulip,souravbadami/zulip,dhcrzf/zulip,aakash-cr7/zulip,sonali0901/zulip,hackerkid/zulip,j831/zulip,brainwane/zulip,tommyip/zulip,tommyip/zulip,sharmaeklavya2/zulip,PhilSk/zulip,christi3k/zulip,ryanbackman/zulip,christi3k/zulip,verma-varsha/zulip,sonali0901/zulip,jackrzhang/zulip,vabs22/zulip,isht3/zulip,vabs22/zulip,dhcrzf/zulip,dhcrzf/zulip,tommyip/zulip,zulip/zulip,kou/zulip,dattatreya303/zulip,dattatreya303/zulip,shubhamdhama/zulip,punchagan/zulip,verma-varsha/zulip,shubhamdhama/zulip,sonali0901/zulip,synicalsyntax/zulip,andersk/zulip,jrowan/zulip,jackrzhang/zulip,kou/zulip,kou/zulip,Galexrt/zulip,SmartPeople/zulip,brainwane/zulip,shubhamdhama/zulip,amanharitsh123/zulip,rht/zulip,ryanbackman/zulip,verma-varsha/zulip,souravbadami/zulip,JPJPJPOPOP/zulip,mahim97/zulip,mahim97/zulip,brockwhittaker/zulip,aakash-cr7/zulip,showell/zulip,blaze225/zulip,synicalsyntax/zulip,zulip/zulip,sonali0901/zulip,isht3/zulip,rishig/zulip,showell/zulip,SmartPeople/zulip,mahim97/zulip,kou/zulip,sharmaeklavya2/zulip,dattatreya303/zulip,timabbott/zulip,hackerkid/zulip,PhilSk/zulip,timabbott/zulip,shubhamdhama/zulip,dhcrzf/zulip,shubhamdhama/zulip,jphilipsen05/zulip,vabs22/zulip,ryanbackman/zulip,brainwane/zulip,sharmaeklavya2/zulip,blaze225/zulip,sharmaeklavya2/zulip,jainayush975/zulip,punchagan/zulip,PhilSk/zulip,samatdav/zulip,vabs22/zulip,ryanbackman/zulip,mahim97/zulip,JPJPJPOPOP/zulip,dawran6/zulip,susansls/zulip,amanharitsh123/zulip,jrowan/zulip,hackerkid/zulip,kou/zulip,dawran6/zulip,souravbadami/zulip,dattatreya303/zulip,brockwhittaker/zulip,blaze225/zulip,timabbott/zulip,vaidap/zulip,susansls/zulip,synicalsyntax/zulip,christi3k/zulip,ryanbackman/zulip,rishig/zulip,eeshangarg/zulip,brockwhittaker/zulip,rht/zulip,mahim97/zulip,tommyip/zulip,rishig/zulip,jainayush975/zulip,zulip/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,zulip/zulip,JPJPJPOPOP/zulip,andersk/zulip,isht3/zulip,showell/zulip,souravbadami/zulip,eeshangarg/zulip,souravbadami/zulip,jackrzhang/zulip