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Feature request: Throw error on empty set #14

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@scramatte

Hi,

First of all thank you for this "node"
To simplify my workflows and avoid to use "if" node, can you implement an option that throw error on empty set ?

What I'm doing is store messages IDs + date into sqlite table.
I want to check if IDs exists to don't resend same message.

Ideally , I would like to throw error if result is empty and append some previous node data to current result if exists

By this way we can branch on error or stop here on empty result

Regards

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