David A. Kennedy 7d70dabf59 Twenty Seventeen: Ensure functions in customize-controls.js don't count on Customizer sections always being present
Before, the code assumed the `theme_options` section is always present, but it can be removed by plugins. This way, if it is, no JavaScript errors occur.

Props westonruter.

Fixes #39335.

Built from https://develop.svn.wordpress.org/trunk@39623


git-svn-id: http://core.svn.wordpress.org/trunk@39563 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-12-20 22:17:40 +00:00
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