1. 删除一颗递归树，遇到空的subList:[] 就删除这个属性，如果subList不为空，就保留

// 输入：

[
    {
        "paramId":500061,
        "sourcePath":"Status",
        "weight":100,
        "subList":[

        ]
    },
    {
        "paramId":500045,
        "sourcePath":"Result",
        "weight":100,
        "subList":[
            {
                "paramId":500042,
                "sourcePath":"Partners",
                "weight":100,
                "subList":[
                    {
                        "paramId":500043,
                        "sourcePath":"StockName",
                        "weight":100,
                        "subList":[

                        ]
                    },
                    {
                        "paramId":500027,
                        "sourcePath":"ShoudDate",
                        "weight":100,
                        "subList":[

                        ]
                    }
                ]
            }
        ]
    }
]

// 输出

[
    {
        "paramId":500061,
        "sourcePath":"Status",
        "weight":100,
    },
    {
        "paramId":500045,
        "sourcePath":"Result",
        "weight":100,
        "subList":[
            {
                "paramId":500042,
                "sourcePath":"Partners",
                "weight":100,
                "subList":[
                    {
                        "paramId":500043,
                        "sourcePath":"StockName",
                        "weight":100,
                    },
                    {
                        "paramId":500027,
                        "sourcePath":"ShoudDate",
                        "weight":100,
                    }
                ]
            }
        ]
    }
]