解决lua调用c++自定义导出函数传递nil参数奔溃问题 #711
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…接口用于接收参数时做检查以lua error代替直接crash。
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对于自定义导出的给lua调用的绑定函数，struct值或者引用参数传递nil会直接导致crash，对此情况新增GetArgsChecked接口用于接收参数时做检查以lua error代替直接crash。
GetArgs必定奔溃例子：UE.FVector.DistSquared(nil, UE.FVector(0,0,0))