Not display empty record in chart

Hi guys,

First: Here is the fiddle that explains clearly my problem : http://ift.tt/166tPpR

To sum up, I have a very simple chart bound to a store. The store has few "empty" records and is like this:

Code:

var storeA = Ext.create('Ext.data.Store', {
    fields: ['name', 'value', 'length'],
    data: [
        {"name": "A-0", "value": 18.34, "length": 30},
        {"name": "A-1", "value": 2.67, "length": 35},
        {"name": "", "value": 0, "length": 0} // this is what I call an empty record
    ]
});

My pie chart is very simple:

Code:

var donut = Ext.create('Ext.chart.PolarChart', {
    title: 'Test',
    animation: true,
    width: 300,
    height: 300,
    renderTo: Ext.getBody(),
    
    store: storeA,
    
    legend: {
        docked: 'bottom'
    },
    
    series: [{
        type: 'pie',
        angleField: 'value',
        lengthField: 'length',
        colors: ["#9aff4f", "#35b4e3", "#ffb400"],
        donut: 20,
        label: {
            field: 'name',
            display: 'inside'
        },
        highlight: true
    }]
});

But I would like that the empty record does not appear in the legend like it does actually:

Capture.PNG

I would like to add that I don't want to clean the store before giving it to the chart. I need to use this exact same store.

Not display empty record in chart