Dominik Schilling (ocean90) 7dc9387dd8 Customize: Handle filtering sidebars_widgets when the underlying option is non-existent.
Fixes warning related to a non-array argument for `array_merge()` in `WP_Customize_Widgets::customize_register()`. 

Merge of [37352] to the 4.5 branch.

See [37166].
See #36389.
Fixes #36660.

git-svn-id: https://develop.svn.wordpress.org/branches/4.5@37453 602fd350-edb4-49c9-b593-d223f7449a82
2016-05-17 20:33:26 +00:00
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