gpg: Fix segv due to NULL value stored as opaque MPI.
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Description

gpg: Fix segv due to NULL value stored as opaque MPI.

* g10/build-packet.c (gpg_mpi_write): Check for NULL return from
gcry_mpi_get_opaque.
(gpg_mpi_write_nohdr, do_key): Ditto.
* g10/keyid.c (hash_public_key): Ditto.

This fix extends commmit 0835d2f44ef62eab51fce6a927908f544e01cf8f.

gpg2 --export --no-default-keyring --keyring TESTDATA

With TESTDATA being below after unpacking.

-----BEGIN PGP ARMORED FILE-----

mBMEhdkMmS8BcX8F8F5voEhQAQmBMEnAAAZwAAo4D/f/8EhQAAAIAEnP8EhQAQ
iBMEnP8AAAAABf8jIID/8EhQYQmBMEnIUAEIgTBKT/AAAAAAUAACCA/f//BIUA
EJgTBJx/AP8ABPPzBJx/AP8ABPPz