Hotfix user restrictor. Wrong usage of set's add method
Hotfix user restrictor. Wrong usage of set's add method

FinnStutzenstein/OpenSlides,jwinzer/OpenSlides,CatoTH/OpenSlides,jwinzer/OpenSlides,FinnStutzenstein/OpenSlides,FinnStutzenstein/OpenSlides,jwinzer/OpenSlides,CatoTH/OpenSlides,jwinzer/OpenSlides,FinnStutzenstein/OpenSlides,CatoTH/OpenSlides,CatoTH/OpenSlides,jwinzer/OpenSlides