disable ModelObserver in UpdateController
disable ModelObserver in UpdateController

as clear-cache is called anyway and there might be a lot of operations done

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