Merge pull request #10 from spjj/filename-fix

correct handling of filename when not extracted from header

download.py

@@ -109,7 +109,7 @@ def download_one_zone(url, output_directory):
     if status_code == 200:
         # Try to get the filename from the header
         _,option = cgi.parse_header(download_zone_response.headers['content-disposition'])
-        filename = option['filename']
+        filename = option.get('filename')
 
         # If could get a filename from the header, then makeup one like [tld].txt.gz
         if not filename: