Fix for an unconvential Mocket usage.

Author: mindflayer

mocket/mocket.py

@@ -421,6 +421,7 @@ def do_nothing(*args, **kwargs):
 
 
 class Mocket:
+    _address = (None, None)
     _entries = collections.defaultdict(list)
     _requests = []
     _namespace = text_type(id(_entries))