Fix inconsistent return value in send_head

chaos_monkey/transport/http.py

@@ -1,10 +1,14 @@
-import urllib, BaseHTTPServer, threading, os.path
-import monkeyfs
-from logging import getLogger
-from base import TransportProxyBase, update_last_serve_time
-from urlparse import urlsplit
+import BaseHTTPServer
+import os.path
 import select
 import socket
+import threading
+import urllib
+from logging import getLogger
+from urlparse import urlsplit
+
+import monkeyfs
+from base import TransportProxyBase, update_last_serve_time
 
 __author__ = 'hoffer'
 
@@ -57,7 +61,7 @@ class FileServHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
     def send_head(self):
         if self.path != '/' + urllib.quote(os.path.basename(self.filename)):
             self.send_error(500, "")
-            return        
+            return None, 0, 0
         f = None
         try:
             f = monkeyfs.open(self.filename, 'rb')