display .Content as long as it is not empty, e.g. the knitr homepage knitr/_index.md should be displayed instead of a list of all pages under knitr/
display .Content as long as it is not empty, e.g. the knitr homepage knitr/_index.md should be displayed instead of a list of all pages under knitr/

yihui/yihui.name,yihui/yihui.name,yihui/yihui.name