gnutls: fix g_tls_file_database_new() with a NULL GError to not crash
gnutls: fix g_tls_file_database_new() with a NULL GError to not crash

GNOME/glib-networking,Distrotech/glib-networking,Distrotech/glib-networking,GNOME/glib-networking,GNOME/glib-networking,Distrotech/glib-networking