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hugolib: Fix .Site.GetPage regression

In Hugo 0.44 we simplified the `.Site.GetPage` API and added code to handle the old-style syntax in most cases.

This logic did not handle the lookup of the home page via `.Site.GetPage "section" ""` and similar. This commit fixes that.

Fixes #4989

--- a/hugolib/page_collections.go

+++ b/hugolib/page_collections.go

@@ -176,7 +176,14 @@

 	if len(refs) == 0 || refs[0] == KindHome {

 		key = "/"

 	} else if len(refs) == 1 {

-		key = refs[0]

+		if len(ref) == 2 && refs[0] == KindSection {

+			// This is an old style reference to the "Home Page section".

+			// Typically fetched via {{ .Site.GetPage "section" .Section }}

+			// See https://github.com/gohugoio/hugo/issues/4989

+			key = "/"

+		} else {

+			key = refs[0]

+		}

 	} else {

 		key = refs[1]

 	}

--- a/hugolib/site_sections_test.go

+++ b/hugolib/site_sections_test.go

@@ -109,6 +109,8 @@

 {{ range .Paginator.Pages }}

 PAG|{{ .Title }}|{{ $sect.InSection . }}

 {{ end }}

+{{/* https://github.com/gohugoio/hugo/issues/4989 */}}

+{{ $sections := (.Site.GetPage "section" .Section).Sections.ByWeight }}

 </html>`)

 	cfg.Set("paginate", 2)