tests: Get line coverage for empty streams results.
tests: Get line coverage for empty streams results.

We have defensive code in functions for combinations
of arguments and/or inputs that doesn't happen
in practice, buts this gets us some line coverage.

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