install statsd middleware if local settings sets it

panikweb/settings.py

@@ -196,6 +196,8 @@ LOGGING = {
     }
 }
 
+STATSD_CLIENT = 'django_statsd.clients.null'
+
 try:
     from local_settings import *
 except ImportError, e:
@@ -212,4 +214,8 @@ if DEBUG and DEBUG_TOOLBAR:
         'INTERCEPT_REDIRECTS': False,
     }
 
-
+if STATSD_CLIENT != 'django_statsd.clients.null':
+    MIDDLEWARE_CLASSES = (
+            'django_statsd.middleware.GraphiteRequestTimingMiddleware',
+            'django_statsd.middleware.GraphiteMiddleware',
+    ) + MIDDLEWARE_CLASSES