From bd55c5e1e259fc022917e28254252bf43d0a9ded Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 25 Aug 2014 09:14:56 +0530
Subject: [PATCH] Conversion: Fix error when converting EPUB/HTML files that
 contain invalid margin or padding declarations. Fixes #1360842 [ePub to PDF
 convertion failed](https://bugs.launchpad.net/calibre/+bug/1360842)

---
 src/calibre/ebooks/oeb/normalize_css.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/oeb/normalize_css.py b/src/calibre/ebooks/oeb/normalize_css.py
index 8d135fde1a..944f63cf7d 100644
--- a/src/calibre/ebooks/oeb/normalize_css.py
+++ b/src/calibre/ebooks/oeb/normalize_css.py
@@ -206,7 +206,7 @@ def normalize_filter_css(props):
 
 def condense_edge(vals):
     edges = {x.name.rpartition('-')[-1]:x.value for x in vals}
-    if len(edges) != 4:
+    if len(edges) != 4 or set(edges) != {'left', 'top', 'right', 'bottom'}:
         return
     ce = {}
     for (x, y) in [('left', 'right'), ('top', 'bottom')]: