hgext/convert/hg.py

--- a/hgext/convert/hg.py	Thu Jul 26 13:34:36 2007 -0700
+++ b/hgext/convert/hg.py	Thu Jul 26 13:34:36 2007 -0700
@@ -59,7 +59,10 @@
             pass
 
     def putcommit(self, files, parents, commit):
-        seen = {}
+        if not files:
+            return hex(self.repo.changelog.tip())
+
+        seen = {hex(nullid): 1}
         pl = []
         for p in parents:
             if p not in seen: