From 230c13129a344530cba55b053e5e2dfb886e0da5 Mon Sep 17 00:00:00 2001
From: Devin Weaver <suki@tritarget.org>
Date: Wed, 9 May 2018 13:04:52 -0400
Subject: [PATCH] Fix undefined xhr bug (#3262)

Closes #3261

Bug introduced in commit f9be41720 ("Minor tweak for RetrieveETag
(#3257)", 2018-05-05)
---
 core/modules/savers/put.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/modules/savers/put.js b/core/modules/savers/put.js
index 473025e2c..3f4f7a9d3 100644
--- a/core/modules/savers/put.js
+++ b/core/modules/savers/put.js
@@ -25,10 +25,10 @@ var RetrieveETag = function(self) {
 		type: "HEAD",
 		headers: headers,
 		callback: function(err, data, xhr) {
+			if(err) return;
 			var etag = xhr.getResponseHeader("ETag");
-			if(!err && etag) {
-				self.etag = etag.replace(/^W\//,"");
-			}
+			if(!etag) return;
+			self.etag = etag.replace(/^W\//,"");
 		}
 	});
 };