diff -r 57f1dbc99631 -r 8678b1eafbcf mercurial/changelog.py
--- a/mercurial/changelog.py	Mon Apr 20 15:27:55 2015 +0200
+++ b/mercurial/changelog.py	Mon Apr 20 17:16:22 2015 +0200
@@ -267,6 +267,8 @@
         self.checkinlinesize(tr)
 
     def readpending(self, file):
+        if not self.opener.exists(file):
+            return # no pending data for changelog
         r = revlog.revlog(self.opener, file)
         self.index = r.index
         self.nodemap = r.nodemap