[crypt32] Fix CertDuplicateCertificateContext for a passed NULL context

[Paul Vriens]

Hi,

I was trying to run PE Explorer 
(http://www.heaventools.com/download/pexsetup.exe) and that crashed due to this.

Changelog
   Fix CertDuplicateCertificateContext for a passed NULL context

-- 
Cheers,

Paul.
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