From 7c2f6056d6db4a2341e6584cd6f9d0284e2d9ac0 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 20 Oct 2013 16:58:18 +0530
Subject: [PATCH] Fix #1242291 [ValueError:min() arg is an empty
 sequence](https://bugs.launchpad.net/calibre/+bug/1242291)

---
 src/calibre/gui2/library/views.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/library/views.py b/src/calibre/gui2/library/views.py
index aa20670738..2718b0335e 100644
--- a/src/calibre/gui2/library/views.py
+++ b/src/calibre/gui2/library/views.py
@@ -700,7 +700,8 @@ class BooksView(QTableView):  # {{{
                 except ValueError:
                     pass
             sections = tuple(x for x in map(f, changed) if x is not None)
-            self.row_header.headerDataChanged(Qt.Vertical, min(sections), max(sections))
+            if sections:
+                self.row_header.headerDataChanged(Qt.Vertical, min(sections), max(sections))
         else:
             # Marked items have either appeared or all been removed
             self.model().set_row_decoration(current_marked)