donut chart data.empty.label.text is overlaped on title.
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- JavaScript
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Description
Hello,
When I use donut chart, data.empty.label.text is overlaped on donut.title.
I think title have to disappear when data is empty.
Can you please support above issue?
thanks.


```
var chart = c3.generate({
data: {
columns: [
['data1', 30],
['data2', 120],
],
type : 'donut',
empty : {
label: {
text: "No Data"
}
}
},
donut: {
title: "Iris Petal Width"
}
});
```
* **C3 version**: 0.7.10
* **D3 version**: v5.16.0
* **Browser**: chrome, explorer
* **OS**: MacOS, Window10
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