OZG-2943 OZG-3103 empty State too if Clear event

...container/vorgang-search/vorgang-search.component.spec.ts

...arch-container/vorgang-search/vorgang-search.component.ts

...ent/libs/vorgang-shared/src/lib/+state/vorgang.actions.ts

...libs/vorgang-shared/src/lib/+state/vorgang.facade.spec.ts

...ient/libs/vorgang-shared/src/lib/+state/vorgang.facade.ts

...ibs/vorgang-shared/src/lib/+state/vorgang.reducer.spec.ts

...ent/libs/vorgang-shared/src/lib/+state/vorgang.reducer.ts

.../libs/vorgang-shared/src/lib/vorgang-list.service.spec.ts

...lient/libs/vorgang-shared/src/lib/vorgang-list.service.ts