QAART-487 Fixed issue which config is now returning empty String instead...

... of null due to Surefire 2.18 change.
Source:
https://jira.codehaus.org/browse/SUREFIRE-649

Surefire 2.18 release note
https://jira.codehaus.org/secure/ReleaseNote.jspa?projectId=10541&version=20175