Fixed error on clearing Venn diagram.
Fixed error on clearing Venn diagram.

XDATA-Year-3/UpSet,syrenio/powerset,XDATA-Year-3/UpSet,XDATA-Year-3/UpSet,XDATA-Year-3/UpSet,zhanghuijun-hello/test,syrenio/powerset,zhanghuijun-hello/test,VCG/upset,syrenio/upset,VCG/upset,syrenio/upset,VCG/upset,zhanghuijun-hello/test,zhanghuijun-hello/test,syrenio/upset,syrenio/upset,syrenio/powerset,XDATA-Year-3/UpSet,VCG/upset,syrenio/powerset