Ensure user external attribute is preserved and not set to nil

What does this MR do and why?

A recent change introduced an issue where external attribute could be nil. This could lead to problems with API responses which expect true or false. This change ensures that nil is not set and that an existing external user doesn't get overridden.

Of note, the database allows null values for this column. We may want to consider updating that as there's no reason this column should be null. Any null value can be changed to false.

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