Added return value to Signal.disconnect().

django/dispatch/dispatcher.py

@@ -160,14 +160,17 @@ class Signal(object):
         else:
             lookup_key = (_make_id(receiver), _make_id(sender))
 
+        disconnected = False
         with self.lock:
             self._clear_dead_receivers()
             for index in range(len(self.receivers)):
                 (r_key, _) = self.receivers[index]
                 if r_key == lookup_key:
+                    disconnected = True
                     del self.receivers[index]
                     break
             self.sender_receivers_cache.clear()
+        return disconnected
 
     def has_listeners(self, sender=None):
         return bool(self._live_receivers(sender))