Update connection.py (#3149)

Exception ignored in: <function Redis.__del__ at ...>
Traceback ....
TypeError: 'NoneType' object cannot be interpreted as an integer.

This happens when closing the connection within a spawned Process (multiprocess).

redis/connection.py

@@ -451,7 +451,7 @@ def disconnect(self, *args):
         if os.getpid() == self.pid:
             try:
                 conn_sock.shutdown(socket.SHUT_RDWR)
-            except OSError:
+            except (OSError, TypeError):
                 pass
 
         try: