made AST renderer more robust for wrong macros
made AST renderer more robust for wrong macros

jsanjuas/Nim,singularperturbation/Nim,haiodo/Nim,dom96/Nim,tulayang/Nim,jsanjuas/Nim,jfhg/Nim,singularperturbation/Nim,mbaulch/Nim,jfhg/Nim,mbaulch/Nim,zachaysan/Nim,russpowers/Nim,zachaysan/Nim,jsanjuas/Nim,haiodo/Nim,endragor/Nim,jfhg/Nim,jsanjuas/Nim,mbaulch/Nim,mbaulch/Nim,haiodo/Nim,jfhg/Nim,mbaulch/Nim,haiodo/Nim,zachaysan/Nim,tulayang/Nim,zachaysan/Nim,endragor/Nim,tulayang/Nim,singularperturbation/Nim,singularperturbation/Nim,singularperturbation/Nim,tulayang/Nim,dom96/Nim,mbaulch/Nim,haiodo/Nim,endragor/Nim,dom96/Nim,russpowers/Nim,endragor/Nim,dom96/Nim,singularperturbation/Nim,russpowers/Nim,zachaysan/Nim,tulayang/Nim,zachaysan/Nim,haiodo/Nim,jsanjuas/Nim,dom96/Nim,mbaulch/Nim,zachaysan/Nim,russpowers/Nim,jfhg/Nim,endragor/Nim,endragor/Nim,haiodo/Nim,jsanjuas/Nim,dom96/Nim,jsanjuas/Nim,russpowers/Nim,russpowers/Nim,jfhg/Nim,jfhg/Nim,endragor/Nim,singularperturbation/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim