Fixed issue where houston was blocking a 404
Fixed issue where houston was blocking a 404

template from rendering.  This is because there was no `Router`
instance in the calling context of `onRouteNotFound`.  It was applying
the function to `null`.

mcoenca/houston,samcorcos/houston,rclai/houston,samcorcos/houston,dgleba/houston,mcoenca/houston,jg3526/houston,dgleba/houston,gterrono/houston,samcorcos/houston,mcoenca/houston,dgleba/houston,gterrono/houston,jg3526/houston,rclai/houston,rclai/houston,jg3526/houston,gterrono/houston