Don't pass request into run_process_media

People(tm) want to start run_process_media from the CLI and might not
have a request object handy. So pass in the feed_url into
run_process_media rather than the request object and allow the feed url
to be empty (resulting in no PuSH notification at all then).

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

mediagoblin/processing/task.py

@@ -94,7 +94,8 @@ class ProcessMedia(task.Task):
             entry.save()
 
             # Notify the PuSH servers as async task
-            handle_push_urls.subtask().delay(feed_url)
+            if mgg.app_config["push_urls"] and feed_url:
+                handle_push_urls.subtask().delay(feed_url)
 
             json_processing_callback(entry)
         except BaseProcessingFail as exc: