Yes! This is possible - it is a hidden/undocumented SAIL function. Try-catch in Appian SAIL: try ( [CODE], "Code failed" )
EDIT: Thank you, Josh, for that insight! Please exercise care when using this function.
I do not recommend using undocumented functionality. Appian does not guarantee that undocumented functions will continue to work when you upgrade from one version to the next.
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