Fix a bug with openapi spec referencing an invalid controller.
Fix a bug with openapi spec referencing an invalid controller.

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