Fixed undefined error

refs https://github.com/TryGhost/Toolbox/issues/135

- Not all callers provide the parameter, so an empty object default saves from unecessary "undefined" errors

test/utils/url-service-utils.js

@@ -17,7 +17,7 @@ module.exports.isFinished = async (options = {disableDbReadyEvent: false}) => {
 };
 
 // @TODO: unify all the reset/softTeset helpers so they either work how the main code works or the reasons why they are different are clear
-module.exports.init = ({urlCache}) => {
+module.exports.init = ({urlCache} = {}) => {
     urlService.init({urlCache});
 };