fix: 修复空指针和类型转换问题

kunlong-luo

2023-02-02 8f2ce95165f90e51d41b083610d00ae346f3a852

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