[GitHub] [incubator-echarts] heloowird opened issue #9158: 加载GeoJSON地图数据失败

[GitHub]

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### One-line summary [问题简述]
加载GeoJSON地图数据失败，GeoJSON数据：[nanchang_geo.json](http://polygons.openstreetmap.fr/get_geojson.py?id=3169865&params=0)



### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]: 
http://www.echartsjs.com/gallery/vendors/echarts/echarts.js
+ Browser version [浏览器类型和版本]: 69.0.3497.100
+ OS Version [操作系统类型和版本]: macOS Sierra 10.12.6





### Expected behaviour [期望结果]

成功加载自定义GeoJSON，并自定义GeoJson上可绘制rect



### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
参考示例：http://echarts.baidu.com/examples/editor.html?c=map-bin
```javascript
...
function loadData(url) {
   var json = null;
    $.ajax({
        'async': false,
        'global': false,
        'url': url,
        'dataType': "json",
        'success': function (data) {
            json = data;
        }
    });
    return json; 
};
var nanchangJson = loadData("data/geo7/nanchang_geo.json");
echarts.registerMap('NC', nanchangJson);
...
option = {
tooltip: {},
    visualMap: {
        type: 'piecewise',
        inverse: true,
        top: 10,
        left: 10,
        pieces: [{
            value: 0, color: COLORS[0]
        }, {
            value: 1, color: COLORS[1]
        }, {
            value: 2, color: COLORS[2]
        }, {
            value: 3, color: COLORS[3]
        }, {
            value: 4, color: COLORS[4]
        }, {
            value: 5, color: COLORS[5]
        }],
        borderColor: '#ccc',
        borderWidth: 2,
        backgroundColor: '#eee',
        dimension: 2,
        inRange: {
            color: COLORS,
            opacity: 0.7
        }
    },
    series: [
        {
            type: 'custom',
            coordinateSystem: 'geo',
            renderItem: renderItem,
            animation: false,
            itemStyle: {
                emphasis: {
                    color: 'yellow'
                }
            },
            encode: {
                tooltip: 2
            },
            data: data["2018-08-22-19"]
        }
    ],
    geo: {
        map: 'NC',
        center: [115.99755, 28.64398],
        zoom: 12,
        roam: true
    }
}

```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
```
echarts.js:44924 Uncaught TypeError: Cannot read property 'length' of undefined
    at getBoundingRect$1 (echarts.js:44924)
    at Object.load (echarts.js:44917)
    at echarts.js:45108
    at Array.forEach (<anonymous>)
    at each$1 (echarts.js:528)
    at Object.load (echarts.js:45107)
    at Object.getFilledRegions (echarts.js:45611)
    at ExtendedClass.optionUpdated (echarts.js:76283)
    at ExtendedClass.<anonymous> (echarts.js:20782)
    at Array.forEach (<anonymous>)
```


[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9158 ]
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