[openssl.org #3307] Return missed NULL-check in CMS_add0_cert back

[Andrey Kulikov via RT]

In 1.0.1g duplicated check for (!pcerts) where removed.

Had an impression that second appearance was check for (!*pcerts) (as in
all other functions).

Return it back.
Patch applied.

0001-Check-pcerts-for-NULL.patch
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