(v0.6.0) Column index tables are raising exceptions due to a number of column mismatch in the JSON output

[mikeengland]

When more than one dimension is specified, column index tables are breaking due to an extra column being added to the list of columns without a dimension name if null values occur in the returned data. This causes data tables to throw an exception and fail to render.

[mikeengland]

Note: You can fix this issue if you use the Coalesce function in the Slicer definition to convert nulls to 'N/A' or another value. This issue is being left open to track progress on handling nulls transparently in the Datatables transformers, without the need to use Coalesce.

Discussion at: #79