allow empty legacy pages set for new root content #850
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When determining legacy pages when purging, the base identifier used is either the parent container or a configured root page. When configured to purge from root and the root page does not yet exist, this can give a misrepresentation of what legacy pages are detected when a parent page is also configured.
This commit changes this by force using the detected root page as the cleanup root. And if the cleanup root does not exist, a
None
root will result in an empty legacy pages set (which is expected).