adamsilverstein 0d73b031c8 JavaScript: when starting Backbone history, stop if previously started.
Prevent a potential error condition if Backbone history is started by a plugin or theme before core tries to start it. 

Props tfrommen.
Fixes #39612.


git-svn-id: https://develop.svn.wordpress.org/trunk@40076 602fd350-edb4-49c9-b593-d223f7449a82
2017-02-17 21:59:37 +00:00
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