[Patch] Bug fix: S/MIME cert chain broken in identity key selection

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

I noticed that Balsa throws a CRITICAL when I try to view the certification chain of a S/MIME certificate 
selected in the Identity dialogue.  The reason: the fingerprint is not passed to function 
libbalsa_gpgme_key().  However, this parameter is reserved for the fingerprint of a signature's subkey.

The simple solution: if the passed fingerprint is NULL, use the one of the first subkey.  If that one is 
/still/ NULL, display a message about a probably broken key instead of throwing the CRITICAL.

The attached patch is suitable for both the master and gmime3 branches.

Opinions?

Cheers,
Albrecht.

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Patch details:
- libbalsa/libbalsa-gpgme-widgets.c: libbalsa_gpgme_key(): fall back to the cert fingerprint for cb 
smime_show_chain() if the passed one is NULL
- libbalsa/x509-cert-widget.c: x509_cert_chain_smime(): display message if the cert fingerprint is NULL, 
requires a litte refactoring

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