From 2c41c0f472c1126c40ca1e0dbd97511c1ee37aa3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 12 Jun 2016 12:27:18 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/metadata/single_download.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/gui2/metadata/single_download.py b/src/calibre/gui2/metadata/single_download.py
index 039eae9d2b..a663152ef5 100644
--- a/src/calibre/gui2/metadata/single_download.py
+++ b/src/calibre/gui2/metadata/single_download.py
@@ -904,7 +904,7 @@ class CoversWidget(QWidget):  # {{{
         if self.continue_processing:
             self.covers_view.clear_failed()
 
-        if self.worker.error is not None:
+        if self.worker.error and self.worker.error.strip():
             error_dialog(self, _('Download failed'),
                     _('Failed to download any covers, click'
                         ' "Show details" for details.'),