graphicLayer.toGeoJSON() 函数 bug

## 问题
graphicLayer.loadGeoJSON() 加载下列三个JSON ，然后graphicLayer.toGeoJSON()获取JSON得到的FeatureCollection里有无效的polygon。
 **===========================json1：**

```
{
    "type": "Feature",
    "properties": {},
    "geometry": {
        "type": "Polygon",
        "coordinates": [
            [
                [
                    123.407701,
                    41.761604
                ],
                [
                    123.407836,
                    41.761593
                ],
                [
                    123.407831,
                    41.761673
                ],
                [
                    123.40792084584292,
                    41.76167760747913
                ],
                [
                    123.40791740284197,
                    41.7617698798579
                ],
                [
                    123.407715,
                    41.76178
                ],
                [
                    123.407701,
                    41.761604
                ]
            ]
        ]
    }
}
```
 **===========================json2：** 
```
{
  "type": "Feature",
  "properties": {},
  "geometry": {
      "type": "Polygon",
      "coordinates": [
          [
              [
                  123.40791981958792,
                  41.7617697590206
              ],
              [
                  123.40792325346952,
                  41.76167773094716
              ],
              [
                  123.407948,
                  41.761679
              ],
              [
                  123.40805,
                  41.761663
              ],
              [
                  123.40804,
                  41.761567
              ],
              [
                  123.408241,
                  41.761554
              ],
              [
                  123.408254,
                  41.761756
              ],
              [
                  123.408075,
                  41.761762
              ],
              [
                  123.40791981958792,
                  41.7617697590206
              ]
          ],
          [
              [
                  123.408126,
                  41.761604
              ],
              [
                  123.408127,
                  41.761694
              ],
              [
                  123.4082,
                  41.761684
              ],
              [
                  123.40819,
                  41.761605
              ],
              [
                  123.408126,
                  41.761604
              ]
          ]
      ]
  }
}
```
 **===========================json3：** 
```
{
  "type": "Feature",
  "properties": {},
  "geometry": {
      "type": "Polygon",
      "coordinates": [
          [
              [
                  123.408126,
                  41.761604
              ],
              [
                  123.40819,
                  41.761605
              ],
              [
                  123.4082,
                  41.761684
              ],
              [
                  123.408127,
                  41.761694
              ],
              [
                  123.408126,
                  41.761604
              ]
          ]
      ]
  }
}
```
 **===========================得到的JSON中异常的对象，多包了一层[]** 
```
"geometry": {
  "type": "Polygon",
  "coordinates": [
      [
          [
              [
                  123.408568,
                  41.766533,
                  0
              ],
              [
                  123.408897,
                  41.766526,
                  0
              ],
              [
                  123.4089,
                  41.766715,
                  0
              ],
              [
                  123.408592,
                  41.766717,
                  0
              ],
              [
                  123.408568,
                  41.766533,
                  0
              ]
          ],
          [
              [
                  123.408747,
                  41.766587,
                  0
              ],
              [
                  123.408756,
                  41.766663,
                  0
              ],
              [
                  123.408857,
                  41.766659,
                  0
              ],
              [
                  123.408842,
                  41.766574,
                  0
              ],
              [
                  123.408747,
                  41.766587,
                  0
              ]
          ]
      ]
  ]
}
```

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