fix: Avoid undesired error message if the last_update_run file is inc…

…orrect during news check (#218)

This commit avoids undesired ` [: : integer expression expected` error message in case the `last_update_run` file is incorrect (e.g. it does not contain a properly formatted date) during the news check.

src/script/arch-update.sh

@@ -385,7 +385,7 @@ list_news() {
 
 			i=1
 			while IFS= read -r line; do
-				if [ -z "${news_option}" ] && [ "${news_dates["${i}-1"]}" -ge "$(date -d "$(cat "${statedir}/last_update_run" 2> /dev/null)" +%s)" ]; then
+				if [ -z "${news_option}" ] && [ "${news_dates["${i}-1"]}" -ge "$(date -d "$(cat "${statedir}/last_update_run" 2> /dev/null)" +%s)" ] 2> /dev/null; then
 					new_tag="$(eval_gettext "[NEW]")"
 					echo -e "${i} - ${line} ${green}${new_tag}${color_off}"
 				else