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Return error if shortcode template.Tree is nil

If a shortcode template fails to compile, the template will be non-nil, but
template.Tree will be nil which caused a panic.

--- a/hugolib/shortcode.go

+++ b/hugolib/shortcode.go

@@ -343,6 +343,9 @@

 			if tmpl == nil {

 				return sc, fmt.Errorf("Unable to locate template for shortcode '%s' in page %s", sc.name, p.BaseFileName())

 			}

+			if tmpl.Tree == nil {

+				return sc, fmt.Errorf("Template for shortcode '%s' failed to compile for page '%s'", sc.name, p.BaseFileName())

+			}

 			isInner = isInnerShortcode(tmpl)

 		case tScParam: