fixes issue with bgcolor being reset to white
fixes issue with bgcolor being reset to white

in some cases (e.g. main timeline starts with empty frames), the background color was reset to solid white

yurydelendik/shumway,mbebenita/shumway,mbebenita/shumway,tschneidereit/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,mbebenita/shumway,yurydelendik/shumway,yurydelendik/shumway,mozilla/shumway,mbebenita/shumway,mozilla/shumway,mozilla/shumway,yurydelendik/shumway,mbebenita/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,yurydelendik/shumway,tschneidereit/shumway,tschneidereit/shumway,yurydelendik/shumway,mbebenita/shumway,mozilla/shumway,yurydelendik/shumway,yurydelendik/shumway,mozilla/shumway,tschneidereit/shumway,mozilla/shumway,tschneidereit/shumway,tschneidereit/shumway