How can I test for the existence of something in jexl? I've set lenient mode off in order to get more information - essentially lenient mode suppresses any interesting errors. But without lenient mode there seems to be no way to test the presence or absence of a variable. I'm looking for something like:
if (foo?) { /* ok foo is a variable, might be null, but that's ok */ }
Is this possible? It is common in template languages, I'm surprised it
isn't here.
Jeff
