Conf: don't define the db_name, fix crash on new startup.
Conf: don't define the db_name, fix crash on new startup.

vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,xrg/openerp-server,splbio/openobject-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,ovnicraft/openerp-server,ovnicraft/openerp-server,xrg/openerp-server,gisce/openobject-server,vnc-biz/openerp-server,gisce/openobject-server,splbio/openobject-server