Adam Silverstein 68c6e9982b Revisions: Address PHP/JS errors when viewing autosave on imported posts.
Fix an issue where viewing an autosave created on a post without any previous revisions would throw a PHP notice. Also fixes the revision screen which was broken in these cases and showed a console error.

Props iseulde.
Fixes #31249.


Built from https://develop.svn.wordpress.org/trunk@50128


git-svn-id: http://core.svn.wordpress.org/trunk@49807 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-02-01 22:03:01 +00:00
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