Allow expressions to be evaluated on null cells too.
Various minor UI polishing touches and minor bug fixes.
git-svn-id: http://google-refine.googlecode.com/svn/trunk@58 7d457c2a-affb-35e4-300a-418c747d4874
Fixed bugs in multi-value cell split/join operations.
Condensed movies-condensed.tsv test data further.
git-svn-id: http://google-refine.googlecode.com/svn/trunk@45 7d457c2a-affb-35e4-300a-418c747d4874