Revert "Throw a noisy error when a post has no layout"
Revert "Throw a noisy error when a post has no layout"

We have to figure out another way. There are perfectly valid reasons not having a layout for a page (I have have some broken sites as result of this).

See #1313

This reverts commit b15934008fd6a1e7bcf9b8a47ab66e33271c4dca.

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