In sendmail-send-it don't switch to non-existent buffer. (Bug#20211)

* mail/sendmail.el (sendmail-send-it): Do not attempt to switch
to non-existent buffer (errbuf is not created when customization
variable mail-interactive is nil).  (Bug#20211)

2 files changed, 10 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index fd346f05afb..69d9ab9f977 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2015-03-30  Richard Ryniker  <ryniker@alum.mit.edu>  (tiny change)
+
+        * mail/sendmail.el (sendmail-send-it): Do not attempt to switch
+        to non-existent buffer (errbuf is not created when customization
+        variable mail-interactive is nil).  (Bug#20211)
+
 2015-03-29  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * emacs-lisp/smie.el (smie-backward-sexp-command)
diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index 7e9bd5bca2f..9fa7aa5a6f2 100644
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -1299,10 +1299,10 @@ external program defined by `sendmail-program'."
                   (error "Sending...failed to %s"
                          (buffer-substring (point-min) (point-max)))))))
       (kill-buffer tembuf)
-      (if (and (bufferp errbuf)
-               (not error))
-          (kill-buffer errbuf)
-        (switch-to-buffer-other-window errbuf)))))
+      (when (buffer-live-p errbuf)
+        (if error
+            (switch-to-buffer-other-window errbuf)
+          (kill-buffer errbuf))))))
 
 (autoload 'rmail-output-to-rmail-buffer "rmailout")