I created a date-time custom field and set it to do a Close Transition Post Function Update with JIRA Suite Utilities. So this works, but any issue that was previously closed is missing a value in the Closed field. This is a newer JIRA installation so I would like to update those issues. Problem is that the issue screen doesn't show the Closed field because in those issues it doesn't have a value.
How do I update a custom field's data when it is blank and doesn't show up in the issue screen?