fix for 687135, pdf file processing error

Alex Cherepanov <[email protected]>
Newsgroups gmane.comp.printing.ghostscript.patches
Organization Coscript Software
Message-ID <[email protected]> 
Igor wrote:
 > Please explain why the empty string is an acceptable default.

First, empty string seems to be a logical default value.
Second, this string is used to calculate decryption
passwords. Since the file is displayed correctly, the default
value is right.

I've tested some other strings and they indeed decrypt
the file to garbage.
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