fix NPE
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@@ -17,7 +17,7 @@ public class DistanceCell<T> implements Callback<TableColumn<T, Double>, TableCe
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@Override
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protected void updateItem(Double item, boolean empty) {
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super.updateItem(item, empty);
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if (empty) {
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if (item == null || empty) {
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setText(null);
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setGraphic(null);
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} else {
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