fix crashes when passing the nil parameters #32
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fix crashes when passing block, selector, id type parameters which the
value are nil.
当js中传递null或者undefined参数的时候在objc中会转化为[NSNull null]对象,按语义undefined应为nil。修复了当block、selector、id这三种参数值为nil的时候引发callSelector方法中invocation调用的崩溃问题。