From 08948d856f8b0ac49f150436eb025a8c3c65a570 Mon Sep 17 00:00:00 2001
From: lysu <sulifx@gmail.com>
Date: Mon, 18 Mar 2019 12:29:50 +0800
Subject: [PATCH] errors: make errors.Trace mid-stack inlineable

---
 juju_adaptor.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/juju_adaptor.go b/juju_adaptor.go
index 8bcfe2f..215b4b5 100644
--- a/juju_adaptor.go
+++ b/juju_adaptor.go
@@ -9,6 +9,9 @@ import (
 
 // Trace just calls AddStack.
 func Trace(err error) error {
+	if err == nil {
+		return nil
+	}
 	return AddStack(err)
 }