No longer bails out if the user requests more attributes to select than there are in the dataset.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11213 e0a1b77d-ad91-4216-81b1-defd5f83fa92
No longer bails out if the user requests more attributes to select than there are in the dataset.

git-svn-id: https://svn.cms.waikato.ac.nz/svn/weka@11214 e0a1b77d-ad91-4216-81b1-defd5f83fa92