# HG changeset patch
# User Benoit Boissinot <benoit.boissinot@ens-lyon.org>
# Date 1147352490 -7200
# Node ID 181b0643ffb16e1bbfb085bbe5cfc119cb5071cc
# Parent  7e43d68f390089eb6189a582dc112571ce678f25
fix a traceback when unbundling does not add any changesets

only run the hooks when some changesets has been added

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1544,8 +1544,9 @@ class localrepository(object):
                          " with %d changes to %d files%s\n")
                          % (changesets, revisions, files, heads))
 
-        self.hook('pretxnchangegroup', throw=True,
-                  node=hex(self.changelog.node(cor+1)), source=srctype)
+        if changesets > 0:
+            self.hook('pretxnchangegroup', throw=True,
+                      node=hex(self.changelog.node(cor+1)), source=srctype)
 
         tr.close()