fix an exception generate split class code with json:

[wuseal]

Fix split class generate code error with next json

{
"text": "MXCHIP won a prize",
"id":1234,
"detail": {
     "comp":"MXCHIP.Inc",
     "from":"Shanghai",
     "focus":"Internet of Things",
     "module":[{"k":"EMW3165"},{"k":"EMW3166"},{"k":"EMW3167"},{"k":"EMW3168"}]
   }
}

before it will generate code like this:

data class Test(
            var detail: Detail = Detail(),
            var id: Int = 0, // 1234
            var text: String = "" // MXCHIP won a prize
        )
        
        data class Detail(
            var comp: String = "", // MXCHIP.Inc
            var focus: String = "", // Internet of Things
            var from: String = "", // Shanghai
            var module: Module = listOf()
        )
        
        data class Module(
            var k: String = "" // EMW3168
        )

var module: Module = listOf()
should be
var module: List<Module> = listOf()

[xurui1995]

LGTM