Why is this change required?
When a site is newly setup and a user has just been created, the
categories and tags sections are hidden from the user. This happens
because the admin has not configured the `default_navigation_menu_categories` or
`default_navigation_menu_tags` site settings. When the categories and tags
sections are hidden from the user, the sidebar looks extremely bare and
does not create a good experience.
What is being change?
In this commit, we're changing the logic such that the site's top
categories and tags are displayed if the user does not have any
categories/tags configured in each respective section. The only
regression introduced in this change is that the categories and tags
section can no longer be hidden as a result. However, we have plans to
address this in the future by allowing sidebar sections to be configured
to be hidden by each individual user.
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