to stop errors on startup (#4900). git-svn-id: svn://localhost/ardour2/branches/3.0@12552 d708f5d6-7413-0410-9779-e7cbd77b26cf
git-svn-id: svn://localhost/ardour2/branches/3.0@11731 d708f5d6-7413-0410-9779-e7cbd77b26cf