client: python crash when receiving malformed packet

[mik3y]

bubar reported this in the forum:

2012-06-30 17:16:11,872 INFO (device-io) Found a Kegboard! Firmware version 11
2012-06-30 17:16:11,879 INFO (kegboard-manager) RX: <HelloMessage: firmware_version=11>
2012-06-30 17:16:11,994 INFO (kegboard-manager) RX: <MeterStatusMessage: meter_name=fl?w0 meter_reading=10>
Exception in thread kegboard-manager:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
self.run()
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/EGG-INFO/scripts/kegboard_daemon.py", line 147, in run
self._HandleDeviceMessage(device_name, device_message)
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/EGG-INFO/scripts/kegboard_daemon.py", line 155, in _HandleDeviceMessage
self._client.SendMeterUpdate(meter_name, curr_val)
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/pykeg/client/net/kegnet.py", line 210, in SendMeterUpdate
return self.SendMessage(message)
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/pykeg/client/net/kegnet.py", line 128, in SendMessage
str_message = msg.ToJson(indent=None)
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/pykeg/client/kbevent.py", line 56, in ToJson
return kbjson.dumps(self.ToDict(), indent=indent)
File "/usr/local/lib/python2.7/dist-packages/kegbot-0.8.5-py2.7.egg/pykeg/core/kbjson.py", line 83, in dumps
return json.dumps(obj, indent=indent, cls=cls)
File "/usr/lib/python2.7/json/__init__.py", line 238, in dumps
**kw).encode(obj)
File "/usr/lib/python2.7/json/encoder.py", line 201, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib/python2.7/json/encoder.py", line 264, in iterencode
return _iterencode(o, 0)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 11: invalid start 

byte2012-06-30 17:22:00,361 ERROR (device-io) Uncaught exception in thread device-io. Stack trace:
[...]