def dumps(self):
    dic = self._data_dict.copy()
    dic['VERSION'] = SERIALIZATION_VERSION
    return json.dumps(dic)
ExtRegistry.get: returns ``None`` for non-existent key.
dataset/ETHPy150Open cloudera/hue/desktop/libs/librdbms/src/librdbms/design.py/SQLdesign.dumps--crossover with--dataset/ETHPy150Open xtrementl/focus/tests/unit/test_registry.py/TestExtRegistry.testNonExistKey__get