(isearch-edit-string): Consider the case when

iserch-string is empty and so are the search rings.

diff --git a/lisp/isearch.el b/lisp/isearch.el
index cd035b08b3edc3df8baddcc164febb7f83127281..bbcc08bf00b98875a311ab051eec68aaa52c6d2a 100644 (file)
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -552,7 +552,7 @@ is treated as a regexp.  See \\[isearch-forward] for more info."
        (or (and transient-mark-mode mark-active)
            (progn
              (push-mark isearch-opoint t)
-             (or executing-macro (> (minibuffer-depth) 0)
+             (or executing-kbd-macro (> (minibuffer-depth) 0)
                  (message "Mark saved where search started"))))))
 
   (setq isearch-mode nil)
@@ -726,8 +726,10 @@ If first char entered is \\[isearch-yank-word], then do word search instead."
 
        ;; Empty isearch-string means use default.
        (if (= 0 (length isearch-string))
-           (setq isearch-string (car (if isearch-regexp regexp-search-ring
-                                       search-ring)))
+           (setq isearch-string (or (car (if isearch-regexp
+                                             regexp-search-ring
+                                           search-ring))
+                                    ""))
          ;; This used to set the last search string,
          ;; but I think it is not right to do that here.
          ;; Only the string actually used should be saved.