解决HighCharts饼图中如果所占百分比为0的时候，不显示边线及0%的方法

<div class="piecleft" id="chart" style="height:350px; width: 350px;">
</div>
<script type="text/javascript" charset="utf-8">
var chart;
$(document).ready(function() {
chart = new Highcharts.Chart({
chart: {
renderTo: 'chart'
},
title: {
text: '版本分布分析'
},
plotArea: {
shadow: null,
borderWidth: null,
backgroundColor: null
},
tooltip: {
formatter: function() {
return '<b>'+ this.point.name +'</b>: '+ Highcharts.numberFormat(this.percentage, 1) +'% ('+
Highcharts.numberFormat(this.y, 0, ',') +' 个)';
}
},
plotOptions: {
pie: {
allowPointSelect: true,
cursor: 'pointer',
dataLabels: {
enabled: true,
formatter: function() {
 if (this.percentage > 0)
                       return '<b>' + this.point.name + '</b>: ' + this.percentage + ' %'; //这里进行判断（看这里）
},
color: 'white',
style: {
font: '13px Trebuchet MS, Verdana, sans-serif'
}
}
}
},
legend: {
backgroundColor: '#FFFFFF',
x: 0,
y: -30
},
credits: {
enabled: false
},
series: [{
type: 'pie',
name: 'Browser share',
data: [
['1.1',3617],
['1.2.1',3436],
['1.0',416],
['1.3',2],
['1.2',1],
['新增对比',5000]
]
}]
});
});
</script>