graft: drop cset description from empty commit message

This is either already redundant in the output or too verbose in quiet
mode.

mercurial/commands.py

@@ -3498,8 +3498,9 b' def graft(ui, repo, *revs, **opts):'
             node = repo.commit(text=message, user=user,
                         date=date, extra=extra, editor=editor)
             if node is None:
-                ui.warn(_('note: graft of %s created no changes to commit\n') %
-                        desc)
+                ui.warn(
+                    _('note: graft of %d:%s created no changes to commit\n') %
+                    (ctx.rev(), ctx))
     finally:
         wlock.release()
 

tests/test-graft.t

@@ -716,5 +716,6 b' Empty graft'
   $ hg up -qr 26
   $ hg tag -f something
   $ hg graft -qr 27
-  $ hg graft -qf 27
-  note: graft of 27:3aaa8b6725f0 "28" created no changes to commit
+  $ hg graft -f 27
+  grafting 27:3aaa8b6725f0 "28"
+  note: graft of 27:3aaa8b6725f0 created no changes to commit