test_signup: Fix assertIsNone check for realm in RealmCreationTest.
test_signup: Fix assertIsNone check for realm in RealmCreationTest.

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