UnknownAttributeException extends from MolgenisDataException
Add tests
Add null controls
Merge branch 'feature/genericdataexplorer' of github.com:molgenis/molgenis into feature/genericdataexplorer
Merge branch 'master' of github.com:molgenis/molgenis into feature/genericdataexplorer
Merge pull request #1214 from jjettenn/feature/genericdataexplorer

Increasing code-coverage