Empty cells in source - Zoomcharts Advanced Network visual

I have a source that includes a column called "sub-attributes". For certain records the cell is sometimes blank and when I use the Network visualization it shows up as (empty). I've tried using the Visual level filters to remove the (Blank) values, but it filters the entire entry if it doesn't contain a value in the "sub-attributes" column.

Is there anyway to have the visual ignore empty cells without removing the entire row?

Thanks,