[Bro-Dev] validate-certs.bro error

[Martin Holste]

Fatal from git rev 005b150:
1314803689.614709 internal error in
/usr/local/bro-005b150/share/bro/policy/protocols/ssl/validate-certs.bro,
line 20: field value missing (SSL::c$ssl)
Aborted

Looks like a basic case where a sub-hash key is being accessed without
verify the parent hash key exists.  I think I fixed with:
if ( !c?$ssl || !c$ssl?$cert || !c$ssl?$cert_chain )