Skip empty group on login check

the data reading was split with " " (space) which in the while read kept
it as one row, changed the split character to "\n"

bin/check_last_login.sh

@@ -111,6 +111,10 @@ for ssh_group in "${ssh_groups[@]}"; do
 		fi;
 	fi;
 	while read -r username; do
+		# skip empty, if group exists but has no users
+		if [ "${username}" = "" ]; then
+			continue;
+		fi;
 		# check that user exists in passwd
 		if ! id "${username}" &>/dev/null; then
 			out_string="[!] User $username does not exists in /etc/passwd file";
@@ -294,7 +298,7 @@ for ssh_group in "${ssh_groups[@]}"; do
 				printf "${CSV_LINE}" "${account_id}" "${region}" "${instance_id}" "$(hostname)" "${username}" "${main_group}" "${ssh_group}" "${user_create_date_out}" "${account_age}" "${last_login_date}" "${last_login}" "${never_logged_in}" "${login_source}" "${out_string}"
 				;;
 		esac;
-	done <<< "$(grep "${ssh_group}:" /etc/group | cut -d ":" -f 4 | sed -e 's/,/ /g')";
+	done <<< "$(grep "${ssh_group}:" /etc/group | cut -d ":" -f 4 | sed -e 's/,/\n/g')";
 done;
 if [ "${OUTPUT_TARGET}" = "text" ]; then
 	if [ -n "${lock_accounts}" ]; then