isNull
Description
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.
Syntax
isNull( value )
Examples
if
(isNull({Root Container.MyProperty}),
0
,
1
)
//returns 0 if the property is null, 1 otherwise.