hugolib: Handle unpecified date for IsFuture and IsExpired
hugolib: Handle unpecified date for IsFuture and IsExpired

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