Dion Hulse 7090cf8980 Updates: When performing an ajax plugin update, rely upon wp_update_plugins() to check the contents of the transient and return early if no request needs to be made.
This works around a bug where custom update handlers are injecting an update into an empty transient, malforming the transient and causing update failures.
Merges [33257] to the 4.2 branch.
Fixes #32198 for 4.2

Built from https://develop.svn.wordpress.org/branches/4.2@33258


git-svn-id: http://core.svn.wordpress.org/branches/4.2@33230 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-07-14 08:04:27 +00:00
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