# HG changeset patch
# User Drew Perttula <drewp@bigasterisk.com>
# Date 2013-06-04 23:52:27
# Node ID 9c8583cd14eaca5e78854be73a33b270c44a4a55
# Parent  ae359590eb8aa6d483862e8325485b6cabff1c2f

better error when network config is missing
Ignore-this: 978b097cca2d8503fd065f89cf9877f6

diff --git a/light9/networking.py b/light9/networking.py
--- a/light9/networking.py
+++ b/light9/networking.py
@@ -10,7 +10,10 @@ class ServiceAddress(object):
     def _url(self):
         graph = getGraph()
         net = graph.value(showUri(), L9['networking'])
-        return str(graph.value(net, self.service))
+        ret = graph.value(net, self.service)
+        if ret is None:
+            raise ValueError("no url for %s %s" % (showUri(), L9['networking']))
+        return str(ret)
 
     @property
     def port(self):