Class attributes that are date attributes need to be treated the same way as classes that are numeric attributes... Behaviour of default methods for classifyInstance() and distributionForInstance() were previously broken for class attributes that were date attributes (they simply returned a missing value.)

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@10478 e0a1b77d-ad91-4216-81b1-defd5f83fa92