permissions: Don't skip 'empty' rows
permissions: Don't skip 'empty' rows

Don't skip entries that have no permissions.

I was wasting some time to track down why my
permission-set --data command wasn't working,
when in reality, the permissions command was
just not listing the entries I was adding :(

flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak