style: Filter error output in --edit-config

src/script/arch-update.sh

@@ -843,7 +843,7 @@ case "${option}" in
 			error_msg "$(eval_gettext "No configuration file found\nYou can generate one with \"arch-update --gen-config\"")"
 			exit 13
 		else
-			if ! "${EDITOR:-nano}" "${config_file}"; then
+			if ! "${EDITOR:-nano}" "${config_file}" 2> /dev/null; then
 				error_msg "$(eval_gettext "Unable to determine the editor to use\nThe \$EDITOR environment variable is not set and \"nano\" (fallback option) is not installed")"
 				exit 13
 			fi