diff -r 273f6a01d18b -r 3b17056b72dc mercurial/hg.py
--- a/mercurial/hg.py	Fri Jun 10 14:10:07 2005 -0800
+++ b/mercurial/hg.py	Sat Jun 11 10:10:06 2005 -0800
@@ -219,6 +219,7 @@
         self.pl = [nullid, nullid]
         try:
             st = self.opener("dirstate").read()
+            if not st: return
         except: return
 
         self.pl = [st[:20], st[20: 40]]