[libchamplain] Added error callback to twisted

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit 7e7107ec8f5dc797ab96cb1b7cdd585d74e34c95
Author: Victor Godoy Poluceno <victorpoluceno gmail com>
Date:   Thu Sep 3 13:31:59 2009 -0300

    Added error callback to twisted

 bindings/python/demos/url-marker.py |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/bindings/python/demos/url-marker.py b/bindings/python/demos/url-marker.py
index d112165..5bdf2ac 100644
--- a/bindings/python/demos/url-marker.py
+++ b/bindings/python/demos/url-marker.py
@@ -49,9 +49,14 @@ def image_download_cb(data, layer, latitude, longitude, url):
     marker.show_all()
 
 
+def image_download_errcb(error):
+    print error
+
+
 def create_marker_from_url(layer, latitude, longitude, url):
     d = httpclient.getPage(url)
     d.addCallback(image_download_cb, layer, latitude, longitude, url)
+    d.addErrback(image_download_errcb)
 
 
 def event_cb(stage, event):