handle exceptions where the url does not return a valid feed

rss_aggregator.py

@@ -169,12 +169,16 @@ def grab_feed(feed_url):
         print(e)
         return False
 
+    if not data.bozo:
         print(data.status, feed_url)
         if data.status == 200:
             #304 means the feed has not been modified since we last checked
             write_etag(feed_name, data)
             return data
         return False
+    else:
+        print(data.bozo_exception, feed_url)
+        return False
     
 
 feed_urls = open('feeds_list.txt','r').read().splitlines()