mypy: Add an Optional in fix_unreads command.
mypy: Add an Optional in fix_unreads command.

showell/zulip,synicalsyntax/zulip,timabbott/zulip,Galexrt/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,jackrzhang/zulip,mahim97/zulip,jackrzhang/zulip,amanharitsh123/zulip,zulip/zulip,hackerkid/zulip,amanharitsh123/zulip,rht/zulip,zulip/zulip,andersk/zulip,rht/zulip,rishig/zulip,dhcrzf/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,rht/zulip,brockwhittaker/zulip,kou/zulip,dhcrzf/zulip,tommyip/zulip,timabbott/zulip,jackrzhang/zulip,brockwhittaker/zulip,Galexrt/zulip,verma-varsha/zulip,tommyip/zulip,brainwane/zulip,hackerkid/zulip,kou/zulip,Galexrt/zulip,rishig/zulip,zulip/zulip,dhcrzf/zulip,mahim97/zulip,jackrzhang/zulip,timabbott/zulip,synicalsyntax/zulip,punchagan/zulip,timabbott/zulip,jackrzhang/zulip,rht/zulip,tommyip/zulip,eeshangarg/zulip,rht/zulip,kou/zulip,andersk/zulip,Galexrt/zulip,kou/zulip,jackrzhang/zulip,hackerkid/zulip,mahim97/zulip,brockwhittaker/zulip,verma-varsha/zulip,shubhamdhama/zulip,shubhamdhama/zulip,timabbott/zulip,tommyip/zulip,kou/zulip,verma-varsha/zulip,punchagan/zulip,synicalsyntax/zulip,hackerkid/zulip,andersk/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,Galexrt/zulip,andersk/zulip,showell/zulip,shubhamdhama/zulip,mahim97/zulip,kou/zulip,tommyip/zulip,eeshangarg/zulip,brockwhittaker/zulip,synicalsyntax/zulip,Galexrt/zulip,shubhamdhama/zulip,zulip/zulip,Galexrt/zulip,mahim97/zulip,rht/zulip,showell/zulip,dhcrzf/zulip,verma-varsha/zulip,zulip/zulip,zulip/zulip,amanharitsh123/zulip,eeshangarg/zulip,andersk/zulip,kou/zulip,zulip/zulip,dhcrzf/zulip,tommyip/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,rishig/zulip,verma-varsha/zulip,mahim97/zulip,eeshangarg/zulip,dhcrzf/zulip,verma-varsha/zulip,punchagan/zulip,synicalsyntax/zulip,brockwhittaker/zulip,brockwhittaker/zulip,shubhamdhama/zulip,amanharitsh123/zulip,hackerkid/zulip,rishig/zulip,timabbott/zulip,tommyip/zulip,showell/zulip,punchagan/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,jackrzhang/zulip,showell/zulip,rishig/zulip,rishig/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,brainwane/zulip,shubhamdhama/zulip,amanharitsh123/zulip,shubhamdhama/zulip,timabbott/zulip,brainwane/zulip,amanharitsh123/zulip