Added better error message for poorly formed frontmatters in archtypes
Added better error message for poorly formed frontmatters in archtypes

anthonyfok/hugo,ryanclarke/hugo,mdhender/hugo,Zenithar/hugo,ifraixedes/hugo,tjyang/hugo,bramp/hugo,coderzh/hugo,mdhender/hugo,halostatue/hugo,bramp/hugo,bogem/hugo,fedelibre/hugo,fedelibre/hugo,ffrizzo/hugo,badoet/hugo,tischda/hugo,fedelibre/hugo,tubo028/hugo,derekperkins/hugo,sprig/hugo,mayah/hugo,Zenithar/hugo,gohugoio/hugo,tischda/hugo,MarkDBlackwell/hugo,abourget/hugo,tatsushid/hugo,gohugoio/hugo,mdhender/hugo,melo/hugo,anthonyfok/hugo,gohugoio/hugo,halostatue/hugo,tatsushid/hugo,mitchchn/hugo,tjyang/hugo,mitchchn/hugo,digitalcraftsman/hugo,soundrussian/hugo,mayah/hugo,ifraixedes/hugo,bogem/hugo,fhergomez/hugo,digitalcraftsman/hugo,kujohn/hugo,fedelibre/hugo,soundrussian/hugo,derekperkins/hugo,melo/hugo,ryanclarke/hugo,vbatoufflet/hugo,mdhender/hugo,badoet/hugo,anthonyfok/hugo,MarkDBlackwell/hugo,vbatoufflet/hugo,coderzh/hugo,jygastaud/hugo,sprig/hugo,tubo028/hugo,jygastaud/hugo,fhergomez/hugo,abourget/hugo,ffrizzo/hugo,kujohn/hugo