David A. Kennedy bccec366ca Twenty Fourteen: Fix fatal errors in WordPress versions before 4.0.0
The line of code throwing the error was introduced in WordPress 4.5 in r37040 "Customize: Require opt-in for selective refresh of widgets". Since `is_customize_preview()` was introduced in 4.0.0 and Twenty Fourteen should work from WordPress 3.6 and up, this caused the issue.

The patch adds an `is_customize_preview` function if it's missing.

Props adamsilverstein.

Fixes #39407.

Built from https://develop.svn.wordpress.org/trunk@40022


git-svn-id: http://core.svn.wordpress.org/trunk@39959 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-01-27 20:31:42 +00:00
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