human
Solve the following python programming problem given the following code:
def test_invalid_default(self) : 
    def filter(val) : 
        if (val == 'invalid') : 
            raise ValueError () 
else : 
            return val 
try : 
        AddConfigVar ('T_config.test_invalid_default_a', doc = 'unittest', configparam = ConfigParam ('invalid', filter = filter), in_c_key = False) 
        assert False 
except ValueError : 
        pass 
THEANO_FLAGS_DICT ['T_config.test_invalid_default_b'] = 'ok' 
    AddConfigVar ('T_config.test_invalid_default_b', doc = 'unittest', configparam = ConfigParam ('invalid', filter = self), in_c_key = False) 
    assert ('T_config.test_invalid_default_b' not in THEANO_FLAGS_DICT) 

    
    

    Fix the buggy line: AddConfigVar ('T_config.test_invalid_default_b', doc = 'unittest', configparam = ConfigParam ('invalid', filter = self), in_c_key = False)
assistant
#Here is Python program to fix the buggy line: AddConfigVar ('T_config.

AddConfigVar ('T_config.test_invalid_default_b', doc = 'unittest', configparam = ConfigParam ('invalid', filter = filter), in_c_key = False)