Handle errors during filesystem walk
Handle errors during filesystem walk

Fixes #2318

mdhender/hugo,jygastaud/hugo,fedelibre/hugo,jygastaud/hugo,anthonyfok/hugo,gohugoio/hugo,tubo028/hugo,ffrizzo/hugo,fedelibre/hugo,gohugoio/hugo,MarkDBlackwell/hugo,digitalcraftsman/hugo,mdhender/hugo,mayah/hugo,Zenithar/hugo,MarkDBlackwell/hugo,tubo028/hugo,bogem/hugo,fedelibre/hugo,ffrizzo/hugo,digitalcraftsman/hugo,anthonyfok/hugo,mitchchn/hugo,bogem/hugo,anthonyfok/hugo,mdhender/hugo,mayah/hugo,gohugoio/hugo,Zenithar/hugo,mdhender/hugo,mitchchn/hugo,fedelibre/hugo