mypy: Split email validation error handling in json_change_settings.
mypy: Split email validation error handling in json_change_settings.

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