[PATCH v1] emacs: Report a lack of matches when calling `notmuch-show'.

diff --git a/e1/ee9d8f0eb69fb669c1c4fca6d61e041d37f112 b/e1/ee9d8f0eb69fb669c1c4fca6d61e041d37f112
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+From: David Edmondson <dme@dme.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v1] emacs: Report a lack of matches when calling\r
+ `notmuch-show'.\r
+Date: Sat,  6 Feb 2016 18:21:32 +0000\r
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+\r
+If the basic query passed to `notmuch-show' generates no results,\r
+throw an error and inform the user that no messages matched the query\r
+rather than displaying an empty buffer and showing an obscure error.\r
+---\r
+ emacs/notmuch-show.el | 8 +++++++-\r
+ 1 file changed, 7 insertions(+), 1 deletion(-)\r
+\r
+diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el\r
+index 3345878..335992e 100644\r
+--- a/emacs/notmuch-show.el\r
++++ b/emacs/notmuch-show.el\r
+@@ -1248,7 +1248,13 @@ function is used."\r
+       (when (and (eq (buffer-size) 0)\r
+                  notmuch-show-query-context)\r
+         (notmuch-show-insert-forest\r
+-         (notmuch-query-get-threads (append cli-args basic-args)))))\r
++         (notmuch-query-get-threads (append cli-args basic-args))))\r
++\r
++      ;; If there are still no results, kill the buffer and throw an\r
++      ;; error.\r
++      (when (eq (buffer-size) 0)\r
++        (kill-buffer (current-buffer))\r
++        (error "No messages matched the query.")))\r
+ \r
+       (jit-lock-register #'notmuch-show-buttonise-links)\r
+ \r
+-- \r
+2.1.4\r
+\r