hi looking to create an if formula for a custom event property to filter out page loads where there is no UTM's found. Having issues with what to put for the null values. Have tried "(not set)", "not set", "empty string" to no avail. Formula right now for example is
and not
( UTM Source = UNDEFINED) and
( UTM Medium = UNDEFINED) and
( UTM etc = UNDEFINED)
),
true,
false
)