emacs: have tag-completion return all tags for nil input

Previously the function would fail if the initial input was nil.  Now
it will return a list of all tags, which obviously makes much more
sense.

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index 8b483995cf7f660099e9e2bda7c1bd6c721d9380..ba833e642e82efc5a30a019b953f154f206e4feb 100644 (file)
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -85,6 +85,8 @@ For example:
 `notmuch-read-tag-changes' function.")
 
 (defun notmuch-tag-completions (&optional search-terms)
+  (if (null search-terms)
+      (setq search-terms (list "*")))
   (split-string
    (with-output-to-string
      (with-current-buffer standard-output