Fix some typing problems

- Using '' as default value is confusing when the function expects a number
  as parameter
- `validateRequiredValue` can take a number as well as a string as first
  parameter

client/src/helpers/helpers.js

@@ -190,7 +190,7 @@ export const getIpList = (interfaces) => Object.values(interfaces)
     .reduce((acc, curr) => acc.concat(curr.ip_addresses), [])
     .sort();
 
-export const getDnsAddress = (ip, port = '') => {
+export const getDnsAddress = (ip, port = 0) => {
     const isStandardDnsPort = port === STANDARD_DNS_PORT;
     let address = ip;
 
@@ -205,7 +205,7 @@ export const getDnsAddress = (ip, port = '') => {
     return address;
 };
 
-export const getWebAddress = (ip, port = '') => {
+export const getWebAddress = (ip, port = 0) => {
     const isStandardWebPort = port === STANDARD_WEB_PORT;
     let address = `http://${ip}`;