Make the dao optional in DAOTableViewSource because required variables have issues being linked with slots.
Make the dao optional in DAOTableViewSource because required variables have issues being linked with slots.

jacksonic/vjlofvhjfgm,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,foam-framework/foam2