Nit-pick: Added a 'default' clause for a switch-case

Change-Id: I241d7cc1cc530b8d3fae7fd7bd185285e16e3b5b
Reviewed-on: https://gerrit.libreoffice.org/7819
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>