There seems to be an error in the Nikto 2.1.4 RPM package for CentOS 6.
1. The link to the nikto configuration is broken, it points to it self.
2. The nikto.dtd is not in the rpm file, henced no xml export of the result.
The first error can be fixed quit easy:
rm -rf nikto.conf
ln -s ./nikto/config nikto.conf
The second error can be fixed by downloading the nikto source from https://cirt.net/nikto/nikto-2.1.4.tar.gz
, and unpacking the nikto.dtd to ex. /etc/nikto and then change the /etc/nikto/config file to point at this nikto.dtd.
I hope this can help others with the same issues.