Dion Hulse 6dc1dd28f5 Themes: Prevent JS error on Themes admin screen when only one theme is installed.
Amends [42029].
Props chetan200891, afercia.
See #42348, westonruter.
Merges [42222] to the 4.9 branch.
Fixes #42673.

Built from https://develop.svn.wordpress.org/branches/4.9@42223


git-svn-id: http://core.svn.wordpress.org/branches/4.9@42052 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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