Default it to None so tests pass.
Default it to None so tests pass.

Plexxi/st2,Plexxi/st2,nzlosh/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,nzlosh/st2,StackStorm/st2,nzlosh/st2,StackStorm/st2,StackStorm/st2,Plexxi/st2