fix additional_properties! builder
fix additional_properties! builder

Windermere/Viewpoint,WinRb/Viewpoint,bcherrington/Viewpoint,gshutler/Viewpoint,Datacom/Viewpoint,getoutreach/Viewpoint,Tsoondev/Viewpoint,Gerd82/Viewpoint,makandra/Viewpoint,Strauman/Viewpoint,albertdang/Viewpoint