codereview: do not send "Abanoned" mail if this CL has

not been mailed out for review.

R=r
CC=golang-dev
https://golang.org/cl/1962046

lib/codereview/codereview.py

@@ -789,7 +789,7 @@ def change(ui, repo, *pats, **opts):
 		if opts["delete"]:
 			if cl.copied_from:
 				return "original author must delete CL; hg change -D will remove locally"
-			PostMessage(ui, cl.name, "*** Abandoned ***")
+			PostMessage(ui, cl.name, "*** Abandoned ***", send_mail=cl.mailed)
 			EditDesc(cl.name, closed="checked")
 		cl.Delete(ui, repo)
 		return