Modify parser to parse logs with Botnet

[geetanjaligg]

To parse logs like:

Expiro 5.102.63.11 - - [31/Jan/2014:10:06:55 +0000] "GET /?f=x HTTP/1.1" 200 3594 "http://www.foo.it/foo.php" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E; InfoPath.2)"

without any error.
If logs do not contain any botnet, then it'll return - for Botnet.