command/jsonplan: Fix sensitive/unknown crash #28253
Merged
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When rendering the JSON plan sensitivity output, if the plan contained unknown collection or structural types, Terraform would crash. We need to detect unknown values before attempting to iterate them.
Unknown collection or structural values cannot have sensitive contents accidentally displayed, as those values are not known until after apply. As a result we return an empty value of the appropriate type for the sensitivity mapping.
This doesn't change the JSON output itself, just resolves a crash.