Huy Do 36fd5f6f49 fix: fail loudly when a fan-out 'items' expression does not resolve to a list (#2957) ...

A non-list result from the items expression is a wiring error (the
template did not resolve to a collection); silently fanning out over
zero items hides it until a confusing downstream failure. Fail the
step with an error naming the expression instead. An explicit empty
list remains valid input.

Fixes #2956

2026-06-16 15:33:11 -05:00

138 KiB

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