Setting IS NULL as viewcriteria

Hello,
A simple question this time. How can one set a viewcriteria to IS NULL.
If you want all records where a particular field is empty?
Regards
Johan

private ViewPmut fCurPmut = null;
fCurPmut = (ViewPmut)fPoemaModule.findViewObject("ViewPmut");
String isNull = "is null";
fCurPmut.setPmutCriteria(fRow.getPersId().toString(),isNull);

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