zscore throws exception for missing member

[rmihael]

Redis documentation states that for missing members of zset it returns (nil). It's naturally to expect None on python's side.

Steps to reproduce:
r=Redis()
r.zadd('test', 'foo', 0)
r.zscore('test', 'bar')

[rmihael]

Exception trace is:

Traceback (most recent call last):
File "...", line 183, in runTest
self.test(_self.arg)
File "...", line 68, in test_remove_in_concurent_env
score = redis.zscore("test_zset", 5)
File "build/bdist.macosx-10.6-universal/egg/redis/client.py", line 863, in zscore
return self.format_bulk('ZSCORE', name, value)
File "build/bdist.macosx-10.6-universal/egg/redis/client.py", line 294, in format_bulk
return self.execute_command(args[0], cmd, *_options)
File "build/bdist.macosx-10.6-universal/egg/redis/client.py", line 220, in execute_command
return self._execute_command(command_name, command, *_options)
File "build/bdist.macosx-10.6-universal/egg/redis/client.py", line 215, in _execute_command
return self.parse_response(command_name, *_options)
File "build/bdist.macosx-10.6-universal/egg/redis/client.py", line 269, in parse_response
return self.RESPONSE_CALLBACKS[command_name](response, **options)
TypeError: float() argument must be a string or a number

[andymccurdy]

Thanks for the bug report. This issue has been fixed in ab3061a