Dominik Schilling 0237d2915a Users: Provide a fallback for incorrect HTTP referrers.
Merge of [41398] to the 3.9 branch.

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git-svn-id: http://core.svn.wordpress.org/branches/3.9@41259 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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