fix a traceback when unbundling does not add any changesets
only run the hooks when some changesets has been added
--- 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()