This fixes cases where the URL to a PDF preview may be incorrectly calculated when no thumbnails were generated for the PDF (and avoids a PHP Notice at the same time). Merges [39612] to the 4.7 branch. Fixes #39250. git-svn-id: https://develop.svn.wordpress.org/branches/4.7@39654 602fd350-edb4-49c9-b593-d223f7449a82
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