Hi Drew, in such cases you can use the IFNULL function: IFNULL statement allows you to control replacement of missing values that are returned by an expression. If a metric expression that is wrapped within an IFNULL statement ever returns a null value, the replacement number specified in the second parameter of the IFNULL function is inserted in place of the null value. More details can be found here:
https://www.gooddata.com/docs/cloud/create-metrics/maql/conditionals/ifnull/