Document portal: Don't raise a critical when removing entries
Document portal: Don't raise a critical when removing entries

We can store a NULL PermissionDbError (which is just an alias for
GVariant) in main_updates, as a "white-out" that indicates that an
entry has been removed. Callig g_variant_unref() on NULL is considered
to be a programming error.

Signed-off-by: Simon McVittie <0e1aea601907c1a85c2dc96e5ea37e23c58d2e9b@debian.org>

flatpak/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,flatpak/xdg-desktop-portal,flatpak/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,matthiasclasen/xdg-desktop-portal,flatpak/xdg-desktop-portal