解决了空指针异常 Bug #60

Job	Run time
chainer-py38-cu113_chainer-py38_chainer-cu113_chainer	15s
all-py38-cu113_all-py38_all-cu113_py38-cu113_all_cu113_py38_latest_all-jupyter-py38-cu113_all-jupyt	42s
all-py38-cpu_all-cpu_py38-cpu_cpu_all-jupyter-py38-cpu_all-jupyter-cpu	15s
chainer-py38-cpu_chainer-cpu	54s
darknet-cpu	49s
darknet-cu113_darknet	15s
keras-py38-cu113_keras-py38_keras-cu113_keras	40s
keras-py38-cpu_keras-cpu	16s
mxnet-py38-cpu_mxnet-cpu	43s
mxnet-py38-cu113_mxnet-py38_mxnet-cu113_mxnet	45s
paddle-py38-cu113_paddle-py38_paddle-cu113_paddle	14s
paddle-py38-cpu_paddle-cpu	15s
pytorch-py38-cu113_pytorch-py38_pytorch-cu113_pytorch	13s
pytorch-py38-cpu_pytorch-cpu	15s
tensorflow-py38-cpu_tensorflow-cpu	16s
tensorflow-py38-cu113_tensorflow-py38_tensorflow-cu113_tensorflow	15s
	7m 2s

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