fix panic 5435 (#5436)
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@@ -28,6 +28,9 @@ func (dnll *VolumeLocationList) Copy() *VolumeLocationList {
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func (dnll *VolumeLocationList) Head() *DataNode {
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//mark first node as master volume
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if dnll.Length() == 0 {
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return nil
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}
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return dnll.list[0]
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}
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