From 5c92a9cbcebe7302b42406893fbb90908576fc09 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Tue, 4 Oct 2016 23:46:48 +0100
Subject: [PATCH] Workaround some browsers which don't tell the error when
 disconnected

---
 src/app.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/app.js b/src/app.js
index 891cac3277..ece2be273a 100644
--- a/src/app.js
+++ b/src/app.js
@@ -413,7 +413,8 @@ var run = function () {
         }
       })
       .fail(function (xhr, text, err) {
-        cb(err);
+        // NOTE: on some browsers, err equals to '' for certain errors (such as offline browser)
+        cb(err || 'Unknown transport error');
       });
   }