use label '<none>' to for values that have not value for groupBy field
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@@ -11,7 +11,7 @@ import org.lucares.pdb.api.Tags;
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public class Grouping {
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public static final String NO_GROUPING = null;
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public static final String DEFAULT_GROUP = "<default>";
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public static final String DEFAULT_GROUP = "<none>";
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private final List<Group> groups = new ArrayList<>();
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private Grouping(final Group group) {
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