I see. In that case, could you try clicking "show missing values"? This will display all attribute values, even if the metric values are missing. I suggest checking first on a table visualization if this is the intended result, if so, please be aware that the missing values features cannot be used on a headline visualization. In such case, you will need to create a metric with FOR EACH:
https://www.gooddata.com/docs/cloud/create-metrics/maql/time/for-each/
Example syntax:
SELECT ... BY ... FOR EACH (attribute/label), (attribute/label), ...