run: Don't fail completion on empty repos
run: Don't fail completion on empty repos

This lets completion keep working for the run command
despite an empty custom installation.

Closes: #2585
Approved by: alexlarsson

flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak