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hugolib: Fix handling of zero-length files

This was a regression in Hugo 0.20. This commit makes sure that zeron-length files are not rendered to file.

Fixes #3355

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1939,6 +1939,10 @@

 		return nil

 	}

+	if renderBuffer.Len() == 0 {

+		return nil

+	}

+

 	outBuffer := bp.GetBuffer()

 	defer bp.PutBuffer(outBuffer)

--- a/hugolib/site_render.go

+++ b/hugolib/site_render.go

@@ -340,6 +340,10 @@

 		return nil

 	}

+	if outBuffer.Len() == 0 {

+		return nil

+	}

+

 	return s.publish("robots.txt", outBuffer)

 }

--- a/hugolib/site_test.go

+++ b/hugolib/site_test.go

@@ -376,6 +376,20 @@

 	require.Equal(t, hugofs.Os, s.Fs.Destination)

 }

+// Issue #3355

+func TestShouldNotWriteZeroLengthFilesToDestination(t *testing.T) {

+	cfg, fs := newTestCfg()

+

+	writeSource(t, fs, filepath.Join("content", "simple.html"), "simple")

+	writeSource(t, fs, filepath.Join("layouts", "_default/single.html"), "{{.Content}}")

+	writeSource(t, fs, filepath.Join("layouts", "_default/list.html"), "")

+

+	s := buildSingleSite(t, deps.DepsCfg{Fs: fs, Cfg: cfg}, BuildCfg{})

+	th := testHelper{s.Cfg, s.Fs, t}

+

+	th.assertFileNotExist(filepath.Join("public", "index.html"))

+}

+

 // Issue #1176

 func TestSectionNaming(t *testing.T) {

 	t.Parallel()

--- a/hugolib/testhelpers_test.go

+++ b/hugolib/testhelpers_test.go

@@ -61,6 +61,12 @@

 	}

 }

+func (th testHelper) assertFileNotExist(filename string) {

+	exists, err := helpers.Exists(filename, th.Fs.Destination)

+	require.NoError(th.T, err)

+	require.False(th.T, exists)

+}

+

 func (th testHelper) replaceDefaultContentLanguageValue(value string) string {

 	defaultInSubDir := th.Cfg.GetBool("defaultContentLanguageInSubDir")

 	replace := th.Cfg.GetString("defaultContentLanguage") + "/"