Improved the error reporting when there is a problem with the incoming instance structure with respect to the configured sort rules.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11132 e0a1b77d-ad91-4216-81b1-defd5f83fa92
Improved the error reporting when there is a problem with the incoming instance structure with respect to the configured sort rules.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11133 e0a1b77d-ad91-4216-81b1-defd5f83fa92