Samigo: Whitespaces between IP addresses prevent saving test's settings

We have found that whitespaces between ip addresses prevent saving the exam.

In our university users copy the ip addresses from a web page where ip addresses have a whitespace in the end. When they try to save the test, a generic error about incorrect ip addresses is displayed and sometimes they have a hard time looking for what is failing.

As ip addresses can't have whitespaces, a simple deletion of any existing whitespace in the string fixes the issue.