MarckK c88af90c0a Add optionality to catch bindings (#634)
* Add optionality to catch bindings (plus tests)

* Update ast/spec, README, set param to null if no param with plugin optionalCatchBinding

* Fix: wrap param = null in else case

* Fix tests for optional catch binding; add tests which include finally clause
2017-07-21 10:18:57 -04:00
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