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Fix Hugo hang up with empty content directory

Site.ReadPagesFromSource returns nil chan error value when a site
content directory is empty but its receiver expects to be passed
something error values via the channel.

This fixes it by returning a channel which will be immediately closed.

Fix #1797

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -876,8 +876,11 @@

 		panic(fmt.Sprintf("s.Source not set %s", s.absContentDir()))

 	}

+	errs := make(chan error)

+

 	if len(s.Source.Files()) < 1 {

-		return nil

+		close(errs)

+		return errs

 	}

 	files := s.Source.Files()

@@ -890,8 +893,6 @@

 	for i := 0; i < procs*4; i++ {

 		go sourceReader(s, filechan, results, wg)

 	}

-

-	errs := make(chan error)

 	// we can only have exactly one result collator, since it makes changes that

 	// must be synchronized.