tpl: Fix nil pointer in Tree()

Fixes #3285

diff --git a/tpl/template.go b/tpl/template.go
index 617aa84ecbe54e5cea542dd6c008b7668910f740..356d66f1e897b4d0f4fa9a2e287d104703101b6b 100644 (file)
--- a/tpl/template.go
+++ b/tpl/template.go
@@ -88,7 +88,7 @@ func (t *TemplateAdapter) Tree() string {
                panic("Unknown template")
        }
 
-       if tree.Root == nil {
+       if tree == nil || tree.Root == nil {
                return ""
        }
        s := tree.Root.String()