Small bug fix in modified version: median should not be computed for nominal attributes.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11292 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Small bug fix in modified version: median should not be computed for nominal attributes.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11293 e0a1b77d-ad91-4216-81b1-defd5f83fa92