From 0fcf1db00a224d055d208601af36406019ad1706 Mon Sep 17 00:00:00 2001
From: Tim Abbott <tabbott@humbughq.com>
Date: Mon, 29 Oct 2012 19:17:26 -0400
Subject: [PATCH] Fix tracebacks sending messages nobody will receive.

(imported from commit afe3d7465f105015f7fa8247ab3cba7476b89fc2)
---
 zephyr/views.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/zephyr/views.py b/zephyr/views.py
index 3c8f3563b6..b4eeb29c5b 100644
--- a/zephyr/views.py
+++ b/zephyr/views.py
@@ -699,6 +699,12 @@ def notify_new_message(request, handler):
     if not validate_notify(request, handler):
         return
 
+    # If a message for some reason has no recipients (e.g. it is sent
+    # by a bot to a stream that nobody is subscribed to), just skip
+    # the message gracefully
+    if request.POST["users"] == "":
+        return
+
     # FIXME: better query
     users   = [UserProfile.objects.get(id=user)
                for user in request.POST['users'].split(',')]