Do not clear the session when trying to read a non-existent desktop file.

* lisp/desktop.el (desktop-read): Do not call desktop-clear when no
desktop file is found.

Fixes: debbugs:18371

lisp/ChangeLog

@@ -14,6 +14,9 @@
 	inhibit-point-motion-hooks in addition to inhibit-read-only.
 	(Bug#18246)
+	* desktop.el (desktop-read): Do not call desktop-clear when no
+	desktop file is found.  (Bug#18371)
+
 2015-01-17  Stefan Monnier  <monnier@iro.umontreal.ca>
 	* emacs-lisp/eieio-core.el (eieio--class-constructor): Rename from

lisp/desktop.el

@@ -1191,7 +1191,6 @@ Using it may cause conflicts.  Use it anyway? " owner)))))
 	    (desktop-auto-save-enable)
 	    t))
       ;; No desktop file found.
-      (desktop-clear)
       (let ((default-directory desktop-dirname))
         (run-hooks 'desktop-no-desktop-file-hook))
       (message "No desktop file.")