mypy: Adjust board_actions.py to allow Optional[Text] values.
mypy: Adjust board_actions.py to allow Optional[Text] values.

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