def send_not_found(self):
        self.send_json({}, 404)
Returns and removes item with lowest priority from queue
dataset/ETHPy150Open UniversalDevicesInc/Polyglot/polyglot/element_manager/api.py/GenericAPIHandler.send_not_found--crossover with--dataset/ETHPy150Open ReactiveX/RxPY/rx/internal/priorityqueue.py/PriorityQueue.dequeue