Github user chtyim commented on a diff in the pull request:
    --- Diff: 
    @@ -193,7 +200,91 @@ private EventHandler 
createEventHandler(TwillSpecification twillSpec) throws Cla
                                     "Class {} does not implements {}",
    -    return Instances.newInstance((Class<? extends EventHandler>) 
    +    final EventHandler delegate = Instances.newInstance((Class<? extends 
EventHandler>) handlerClass);
    +    if (delegate == null) {
    +      // if no handler is specified, return an EventHandler with no-op
    +      return new EventHandler() {};
    +    }
    +    // wrap the delegate EventHandler so that all errors will be caught
    +    return new EventHandler() {
    --- End diff --
    hum.. that's true.. maybe we should keep it.

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