PLF-5235 | GettingStarted Portlet : Can not load task list

* Problem Analysis:
A NPE is thrown when the `reload` argument of below method is ```null```
```org.exoplatform.platform.portlet.juzu.gettingstarted.GettingStarted#getGsList```
* Fix description:
Use a reverse equals check on the string parameter to avoid calling it on a null variable.