In normal case the properties, which are empty are not considered as a candidate for translation in the destination and are ignored, which is plausible. But sometimes a property is empty because it has been removed by the editor. In this case the property in destination must also be removed.

In this PL it is checked when in source language a property is empty but has a value in destination, it won't be ignored and will be translated and as a consequence is cleaned up in destination.