Jonas Jenwald 1fea44ce14 Ensure that |get fingerprint| doesn't fail if the ID is not an array (issue 5599)
According to the [PDF specification](http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#page=51) the `ID` should be an array. To prevent errors if the PDF file violates that part of the spec, check that the `ID` is actually an array.

Fixes 5599.
2014-12-30 16:16:43 +01:00
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