* vc-bzr.el (vc-bzr-show-log-entry):

* vc-git.el (vc-git-show-log-entry): Deal with a nil argument,
C-x v l for a directory uses that.

lisp/ChangeLog

+2008-09-18  Dan Nicolaescu  <dann@ics.uci.edu>
+
+	* vc-bzr.el (vc-bzr-show-log-entry):
+	* vc-git.el (vc-git-show-log-entry): Deal with a nil argument,
+	C-x v l for a directory uses that.
+
 2008-09-18  Simon Josefsson  <simon@josefsson.org>
 
 	* files.el (auto-mode-alist): Use sieve-mode for .sv, .siv, and

lisp/vc-bzr.el

@@ -468,15 +468,17 @@ REV non-nil gets an error."
 (defun vc-bzr-show-log-entry (revision)
   "Find entry for patch name REVISION in bzr change log buffer."
   (goto-char (point-min))
-  (let (case-fold-search)
-    (if (re-search-forward
-	 ;; "revno:" can appear either at the beginning of a line, or indented.
-	 (concat "^[ ]*-+\n[ ]*revno: "
-		 ;; The revision can contain ".", quote it so that it
-		 ;; does not interfere with regexp matching.
-		 (regexp-quote revision) "$") nil t)
-        (beginning-of-line 0)
-      (goto-char (point-min)))))
+  (when revision
+    (let (case-fold-search)
+      (if (re-search-forward
+	   ;; "revno:" can appear either at the beginning of a line,
+	   ;; or indented.
+	   (concat "^[ ]*-+\n[ ]*revno: "
+		   ;; The revision can contain ".", quote it so that it
+		   ;; does not interfere with regexp matching.
+		   (regexp-quote revision) "$") nil t)
+	  (beginning-of-line 0)
+	(goto-char (point-min))))))
 
 (defun vc-bzr-diff (files &optional rev1 rev2 buffer)
   "VC bzr backend for diff."

lisp/vc-git.el

@@ -491,12 +491,13 @@
 REVISION may have the form BRANCH, BRANCH~N,
 or BRANCH^ (where \"^\" can be repeated)."
   (goto-char (point-min))
-  (search-forward "\ncommit" nil t
-                  (cond ((string-match "~\\([0-9]\\)$" revision)
-                         (1+ (string-to-number (match-string 1 revision))))
-                        ((string-match "\\^+$" revision)
-                         (1+ (length (match-string 0 revision))))
-                        (t nil)))
+  (when revision
+    (search-forward "\ncommit" nil t
+		    (cond ((string-match "~\\([0-9]\\)$" revision)
+			   (1+ (string-to-number (match-string 1 revision))))
+			  ((string-match "\\^+$" revision)
+			   (1+ (length (match-string 0 revision))))
+			  (t nil))))
   (beginning-of-line))
 
 (defun vc-git-diff (files &optional rev1 rev2 buffer)