Dion Hulse 15a94f7c00 Customize: Allow (optional) url parameter to be omitted in intercepted calls to history.pushState() and history.replaceState() in customize preview.
Fixes issue where calls without the `url` parameter erroneously end up rewriting the location path to `/undefined`.

Props Christian1012, westonruter.
Merges [39547] to the 4.7 branch.
Fixes #39175.

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git-svn-id: http://core.svn.wordpress.org/branches/4.7@39514 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-12-12 02:11:33 +00:00
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