--- a/mercurial/changegroup.py	Sat Jul 01 00:00:09 2017 -0700
+++ b/mercurial/changegroup.py	Fri Jun 30 23:58:59 2017 -0700
@@ -298,7 +298,8 @@
             efiles = len(efiles)
 
             if not cgnodes:
-                raise error.Abort(_("received changelog group is empty"))
+                repo.ui.develwarn('applied empty changegroup',
+                                  config='empty-changegroup')
             clend = len(cl)
             changesets = clend - clstart
             repo.ui.progress(_('changesets'), None)