Fix crash when rendering markdown
Fix crash when rendering markdown

When rendering a link, don't crash if the uri is not valid.
directhex/xwt,mminns/xwt,mono/xwt,steffenWi/xwt,akrisiun/xwt,residuum/xwt,hwthomas/xwt,antmicro/xwt,lytico/xwt,TheBrainTech/xwt,cra0zy/xwt,sevoku/xwt,iainx/xwt,mminns/xwt,hamekoz/xwt