Joe McGill 71d3cd298e Media: Improve handling of extensionless filenames.
Merge of [37756] to the 3.7 branch.

See #37111.

git-svn-id: https://develop.svn.wordpress.org/branches/3.7@37825 602fd350-edb4-49c9-b593-d223f7449a82
2016-06-21 15:01:26 +00:00
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