I don't see any current way to throw an exception on null evaluation through
configuration.
A case can be made to add this as a feature (a hook checking eval result
before doPrint in TemplateInterpreter).
And about making this use case, you can't workaround using a conditional
(${user3.firstName?:error()}) and you definitely must throw an error in the
case of null evaluation?
Cheers
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