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Print error when /index.html is zero-length

Also print warning (in verbose mode) for other empty pages.

See #947

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1478,6 +1478,20 @@

 	transformer := transform.NewChain(transformLinks...)

 	transformer.Apply(outBuffer, renderBuffer, path)

+	if outBuffer.Len() == 0 {

+		jww.WARN.Printf("%q is rendered empty\n", dest)

+		if dest == "/" {

+			jww.ERROR.Println("=============================================================")

+			jww.ERROR.Println("Your rendered home page is blank: /index.html is zero-length")

+			jww.ERROR.Println(" * Did you specify a theme on the command-line or in your")

+			jww.ERROR.Printf("   %q file?  (Current theme: %q)\n", filepath.Base(viper.ConfigFileUsed()), viper.GetString("Theme"))

+			if !viper.GetBool("Verbose") {

+				jww.ERROR.Println(" * For more debugging information, run \"hugo -v\"")

+			}

+			jww.ERROR.Println("=============================================================")

+		}

+	}

+

 	if err == nil {

 		if err = s.WriteDestPage(dest, outBuffer); err != nil {

 			return err