gpg: Do not bail on an invalid packet in the local keyring.
* g10/keydb.c (parse_keyblock_image): Treat invalid packet special.
This is in particular useful to run --list-keys on a keyring with
corrupted packets. The extra flush is to keep the diagnostic close to
the regular --list-key output.
- Signed-off-by: Werner Koch <firstname.lastname@example.org>