http://lists.xensource.com/archives/html/xen-devel/2011-11/msg00218.html

diff -r 54a5e994a241 -r 76391f599433 tools/python/xen/xend/XendStateStore.py
--- a/tools/python/xen/xend/XendStateStore.py   Wed Nov 02 17:09:09 2011 +0000
+++ b/tools/python/xen/xend/XendStateStore.py   Thu Nov 03 12:02:44 2011 -0400
@@ -101,6 +101,9 @@ class XendStateStore:
         if not os.path.exists(xml_path):
             return {}
 
+        if not os.path.getsize(xml_path) == 0:
+            return {}
+
         dom = minidom.parse(xml_path)
         root = dom.documentElement
         state = {}