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hugolib: Allow nil to be unwrapped as *Page

Previously, calls to *Page.Eq(nil) would always return false because the
unwrapPage func didn't support the nil case.  Add support for unwrapping
nil to a *Page.

Fixes #5043

--- a/hugolib/site_sections.go

+++ b/hugolib/site_sections.go

@@ -152,6 +152,8 @@

 		return v.Page, nil

 	case *PageWithoutContent:

 		return v.Page, nil

+	case nil:

+		return nil, nil

 	default:

 		return nil, fmt.Errorf("%T not supported", in)

 	}

--- a/hugolib/site_sections_test.go

+++ b/hugolib/site_sections_test.go

@@ -166,6 +166,11 @@

 			assert.Equal("empty3.md", b.Pages[0].File.LogicalName())

 		}},

+		{"empty3", func(p *Page) {

+			xxx := p.s.getPage(KindPage, "empty3", "nil")

+			assert.Nil(xxx)

+			assert.Equal(xxx.Eq(nil), true)

+		}},

 		{"top", func(p *Page) {

 			assert.Equal("Tops", p.title)

 			assert.Len(p.Pages, 2)

-- 

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