Rest_Model: Only use Kwf_Date and Kwf_DateTime if value is not null.
Rest_Model: Only use Kwf_Date and Kwf_DateTime if value is not null.

Before it wasn't possible to save null for date or datetime into
database

nsams/koala-framework,nsams/koala-framework,koala-framework/koala-framework,kaufmo/koala-framework,yacon/koala-framework,Ben-Ho/koala-framework,Sogl/koala-framework,nsams/koala-framework,Sogl/koala-framework,yacon/koala-framework,koala-framework/koala-framework,Ben-Ho/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,yacon/koala-framework