Fixed up some views and made 'published_at' fall back to 'created_at'.
Fixed up some views and made 'published_at' fall back to 'created_at'.

Everything publicly visible will be published, so falling back only
affects the admin pages, where I think it's probably okay.

git-svn-id: 70ab0960c3db1cbf656efd6df54a8f3de72dc710@1049 820eb932-12ee-0310-9ca8-eeb645f39767

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