Revert "Throw a more user-friendly exception."
Revert "Throw a more user-friendly exception."

This reverts commit ba1016befde87a9275f645da998d3ea73f751881.

tonybaloney/st2,Plexxi/st2,emedvedev/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,pixelrebel/st2,tonybaloney/st2,peak6/st2,Plexxi/st2,nzlosh/st2,punalpatel/st2,lakshmi-kannan/st2,pixelrebel/st2,punalpatel/st2,emedvedev/st2,nzlosh/st2,punalpatel/st2,StackStorm/st2,lakshmi-kannan/st2,tonybaloney/st2,Plexxi/st2,Plexxi/st2,lakshmi-kannan/st2,nzlosh/st2,StackStorm/st2,pixelrebel/st2,peak6/st2,peak6/st2,emedvedev/st2