split multinodepicker ids, get node-names and add them to a list
UmbracoHelper umbhelper = new UmbracoHelper(UmbracoContext.Current);
AllowedFontSizes = (PlateNode.GetPropertyValue<string>("AllowedFontSizes") ?? "")
.Split(',')
.Select(v => umbhelper.TypedContent(v))
.Where(c => c != null)
.Select(c => c.Name)
.ToList();