添加对可能空指针的判断

648540858

2022-01-28 8cfff8db97b7e51578424b6a202ae80cd56923a2

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[submodule "be.teletask.onvif-java"]
    path = be.teletask.onvif-java
    url = https://gitee.com/pan648540858/be.teletask.onvif-java.git