--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1196,8 +1196,6 @@ class revlog(object):
start = self.start(base)
end = self.end(t)
- if node is None:
- raise RevlogError(_("group to be added is empty"))
return node
def strip(self, rev, minlink):