Fix bug: Empty "chain_file" is not nil, so causes errors.

Initial change made in 2aea2acfadeaf66c73c0f3eea39afc137ae94636
Hashing out the attributes so they are still easy to add back in.
Update the mod_wsgi file for SSL for havana
Merge pull request #155 from andymcc/sslFix

Merged automatically by jenkins after successful build test