[Xen-changelog] Explicit test for None.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 40e6dfad4eff688ace19c53d2d63ef0d5656f4b7
# Parent  1585590ec4746fe8b09d3c8856e1dd2fb303dada
Explicit test for None.
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 1585590ec474 -r 40e6dfad4eff 
tools/python/xen/xend/xenstore/xstransact.py
--- a/tools/python/xen/xend/xenstore/xstransact.py      Wed Sep 14 19:34:13 2005
+++ b/tools/python/xen/xend/xenstore/xstransact.py      Wed Sep 14 19:52:04 2005
@@ -138,10 +138,10 @@
                     raise TypeError
             else:
                 (key, val, fmt) = tup
-            if val:
+            if val is None:
+                self._remove(key)
+            else:
                 self._write(key, fmt % val)
-            else:
-                self._remove(key)
 
 
     def Read(cls, path, *args):

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