Default, for now, to NOT publishing.

docs/config.html

@@ -119,8 +119,9 @@ cache.  If specified as a relative path, it is evaluated relative to the
 kept for each source when expunging old entries from the cache directory.
 This may be overriden on a per subscription feed basis.</dd>
 <dt><ins>pubsubhubbub_hub</ins></dt>
-<dd>URL to a PubSubHubbub hub, or None to disable. Default is the
-Google App Engine open hub.  Used by <code>publish</code> to ping the
+<dd>URL to a PubSubHubbub hub, for example <a
+href="http://pubsubhubbub.appspot.com">http://pubsubhubbub.appspot.com</a>.
+Used by <code>publish</code> to ping the
 hub when feeds are published, speeding delivery of updates to
 subscribers.  See
 the <a href="http://code.google.com/p/pubsubhubbub/"> PubSubHubbub

planet.py

@@ -88,7 +88,7 @@ if __name__ == "__main__":
 
     splice.apply(doc.toxml('utf-8'))
 
-    if not no_publish:
+    if config.pubsubhubbub.hub() and not no_publish:
         from planet import publish
         publish.publish(config)
 

planet/config.py

@@ -105,8 +105,7 @@ def __init__():
     define_planet('output_theme', '')
     define_planet('output_dir', 'output')
     define_planet('spider_threads', 0) 
-    # set pubsubhubbub_hub to None to prevent it from being emitted
-    define_planet('pubsubhubbub_hub', 'http://pubsubhubbub.appspot.com') 
+    define_planet('pubsubhubbub_hub', '')
 
     define_planet_int('new_feed_items', 0) 
     define_planet_int('feed_timeout', 20)