Fixed clearing votes for assignments.
Fixed clearing votes for assignments.

emanuelschuetze/openslides-votecollector,OpenSlides/openslides-votecollector,OpenSlides/openslides-votecollector,jwinzer/openslides-votecollector,jwinzer/openslides-votecollector,jwinzer/openslides-votecollector,emanuelschuetze/openslides-votecollector,OpenSlides/openslides-votecollector,emanuelschuetze/openslides-votecollector