Logic / isNull

isNull(value)

Tests to see whether or not the argument value is null or not. Note that you can also check for null by simply comparing the value to the null keyword. isNull(x) is the same as x = null.

if(isNull({Root Container.MyProperty}), 0, 1)

... returns 0 if the property is null, 1 otherwise. See also: coalesce.