Clear absent / empty communities

[dessalines]

Saving these queries for later:

select count(*) from ( select community.id, actor_id, count(post.id) from community left join post on post.community_id = community.id group by community.id having count(post.id) = 0) as a

select count(*) from community;

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[Nutomic]

How about adding this kind of stuff to the documentation instead?