Filter for empty cells
In the filter dialogs for tables, you also have the option of filtering the table according to the entries "without value".
To do this, activate the "Only display cells without a value" checkbox in the filter conditions of the columns. This will find all elements in the table that have no value or the value "n/a" in the column.
For columns with strings, the checkbox is called "Show empty cells only", as the elements that provide "n/a" are not included here. To search for "n/a", enter "n/a" in the "Search for" input field in these columns.
These filter options are available both in the parameter and filter field above the table and directly in the column headings.
Please also read the section Filter tables.