This fixes a place where we omit passing a GError pointer and therefore
potentially return FALSE without setting the passed in error. This
causes flatpak_installation_list_installed_refs_for_update() to hit an
assertion failure, crashing libflatpak (and subsequently the App Center
when it's used).
The debug log provided by the user shows messages being printed from
flatpak_dir_prepare_resolve_p2p_refs_helper() for only a subset of the
refs being resolved, and then the log stops since the process crashes,
so that's how I know with near certainty that this patch fixes the
crash experienced by the user on the forum.[1]
Cherry-picked from https://github.com/endlessm/flatpak/pull/224
[1] https://community.endlessos.com/t/appcenter-closes-after-startup/13308
4f04637b24