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If an application calls g_app_info_launch_uris() with a GList that includes NULL values in some of its data members, and GIO ends up internally calling g_desktop_app_info_launch_uris_with_spawn() for whatever reason (e.g. no D-Bus session available), expand_macro() will crash due to the invalid data. As this is considered a programmer error, use g_return_val_if_fail() in those situations to prevent the crash from happening, but printing a warning anyway. https://bugzilla.gnome.org/show_bug.cgi?id=791337
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