test-doc-portal: skip all tests if no FUSE
test-doc-portal: skip all tests if no FUSE

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

GeorgesStavracas/flatpak,matthiasclasen/xdg-app,amigadave/flatpak,handsome-feng/flatpak,alexlarsson/xdg-app,GeorgesStavracas/flatpak,matthiasclasen/xdg-app,flatpak/flatpak,matthiasclasen/xdg-app,matthiasclasen/flatpak,amigadave/flatpak,alexlarsson/xdg-app,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/xdg-app,flatpak/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,GeorgesStavracas/flatpak,alexlarsson/xdg-app,flatpak/flatpak,GeorgesStavracas/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,alexlarsson/xdg-app,flatpak/flatpak,handsome-feng/flatpak,amigadave/flatpak,amigadave/flatpak