The column filters on the perspective table don't currently have a way to filter for null values when the nullFormatValue is 'blank'.

When nullFormatValue is 'N/A' or 'null' then those values can be filtered for as though filtering for any other string value.

In vision the power table column filters have an option (Empty) that filters for null values.

It would be useful to add an option to show blanks/null values into all of the column filter types (number, date, boolean, string) so that null values can be filtered for when rendering them as blanks. This could possibly be added into the 'Select condition' dropdown.