Pascal Birchler a60ac4684b Themes: Do not show an update button if there's no update package.
This updates the list view to match the existing behaviour in the single theme modal.

Props tristangemus for initial patch.
Fixes #37774.
Built from https://develop.svn.wordpress.org/trunk@38788


git-svn-id: http://core.svn.wordpress.org/trunk@38731 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-10-14 13:33:29 +00:00
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