"Stream" valid PKCS7 objects with omitted content

The PKCS#7 standard marks the content element of the ContentInfo OPTIONAL.
Accordingly, a PKCS#7 object only containing a Content Type OID is valid:

  SEQUENCE {
    OBJECT_IDENTIFIER { 1.2.840.113549.1.7.4 }
  }

Deserializing such an object works and therefore streaming should at least
have the decency of not segfaulting. Of course there's nothing decent about
PKCS#7 be it the standard or its OpenSSL "implementation".

Exercises a problem reported by Acts1361 and currently crashes.
To be fixed in pk7_lib.c r1.32.

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