Filter for Null
To filter for null in a given field, create an expression and place it in the board's display view within the <eocrepeatallrecords> tag.
For example:
<expression name="fieldnameNull">isNull(fieldname, 0)</expression>
Following this, create a filter and set the criteria:
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To show null values, fieldnameNull = 0
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To hide null valued entries, fieldnameNull <> 0
The field you are filtering for is a text field. Put quotation marks around the value in the filter, as in <expression name="fieldnameNull">isNull(fieldname, '0')</expression>.
Then, create a filter and set the criteria fieldnameNull = '0' to show null values. To hide null valued entries, use fieldnameNull <> '0'.
If the field you want to test for null is status, it appears similarly to <expression name="statusNull">isNull(status, '0')</expression> and statusNull = '0'. Alternatively, it may present as <expression name="RemoveNull">isNull(Remove, 'No')</expression>.