* Ensure closure gets called when neither returnStdout nor returnStatus are set
In this case we do not have a return value, but in case we execute a closure we should execute the closure.
With that it is possible to raise an exception from the closure.
* [refactoring] unify usage of unify method call
* Remove dead code.
Coding after uncondition throw exception statement does not get executed.
* Ensure script rule behaves the same whan called with string and with map.
e954e3b629