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Pie Charts if all the data are 0, should show blank, not evenly divided the pie.

See original GitHub issue

问题简述 (One-line summary)

If there are for example 4 data elements and the values are all 0, it should show a blank pie, not a pie evenly divided by 4.

版本及环境 (Version & Environment)

ECharts 版本 (ECharts version): v3.1.10
浏览器类型和版本 (Browser version): any browser
操作系统类型和版本 (OS Version): windows7

current pie chart: Uploading piecurrent.p piecurrent ng…

重现步骤 (Steps to reproduce)

1.use the option provided to draw the piechart

期望结果 (Expected behaviour)

expected

可能哪里有问题 (What went wrong)

When sum is 0, assume all the parts are 2pi/N. In fact, 0 means occupy nothing no matter sum is 0 or not. The user should see nothing except the circle boundary to show no data at all.

ECharts配置项 (ECharts option)

option = {
                series: [
                  {
                      type: "pie",
                      radius: "65%",
                      itemStyle: {
                          normal: {
                              borderColor: '#fff',
                              borderWidth: '0'
                          },
                          emphasis: {
                              borderColor: '#fff',
                              borderWidth: '0'
                          }
                      },
                      label: {
                          normal: {
                              show: false
                          }
                      },
                      center: ["50%", "43%"],
                      data: [
                        {
                            "name": "21-40%",
                            "value": "0"
                        },
                        {
                            "name": "41-60%",
                            "value": "0"
                        },
                        {
                            "name": "61-80%",
                            "value": "0"
                        },
                        {
                            "name": "81-100%",
                            "value": "0"
                        }
                      ]
                  }
                ],
                color: [
                  "#FF8C00",
                  "#FFD700",
                  "#6B8E23",
                  "#3D3D3D"
                ],
                title: {
                    show: true,
                    text: "Sample",
                    left: "center",
                    top: "top"
                },
                legend: {
                    data: [
                      "21-40%",
                      "41-60%",
                      "61-80%",
                      "81-100%"
                    ],
                    left: 'center',
                    bottom: '10',
                    borderWidth: 1,
                    borderColor: '#FAAC58',
                },
                tooltip: {
                    show: true,
                    showContent: true,
                    trigger: 'item',
                    formatter: '{b}:<br />{c}',
                }

}