subdomains: Simplify a funny call site of get_subdomain.
subdomains: Simplify a funny call site of get_subdomain.

The type of get_subdomain's parameter is non-Optional, and
in fact if passed an argument of None it would promptly
blow up.  So this `getattr` can't be serving any purpose.

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