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.

diff --git a/hugolib/shortcode.go b/hugolib/shortcode.go
index 5fb9b7cc8cfaa1cd70c677f2e8b378b33ecd2b85..e65a859892b2b63d14e4f14eaa8c0906039abfcd 100644 (file)
--- a/hugolib/shortcode.go
+++ b/hugolib/shortcode.go
@@ -343,6 +343,9 @@ Loop:
                        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: