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It is not a problem for template actions because it does not result in errors if the column is missing, as you indicated.
But the validation is done by calling the validate method of each action, which will return false if custom column is not present. e.g. single field edit, search and replace ... etc validate methods check whether the column(s) is present.
Anyway, changing the check_chain() to only validate if the conditions are true is not a big deal.
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