This looks like dbconfig-related - that parameter is fetched in /usr/share/dbconfig-common/dpkg/common, not directly in any Bugzilla stuff (in fact, checksetup.pl passes just fine).
The face that there is an empty Postgres section in /etc/dbconfig-common/bugzilla.conf may be related: ## ## postgresql specific settings. if you don't use postgresql, ## you can safely ignore all of these ## # dbc_ssl: should we require ssl? # set to "true" to require that connections use ssl dbc_ssl="" -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]