Updated JPMML-Converter dependency

pom.xml

@@ -68,13 +68,13 @@
 		<dependency>
 			<groupId>org.jpmml</groupId>
 			<artifactId>jpmml-converter</artifactId>
-			<version>1.4.4</version>
+			<version>1.4.6</version>
 		</dependency>
 
 		<dependency>
 			<groupId>org.jpmml</groupId>
 			<artifactId>jpmml-xgboost</artifactId>
-			<version>1.4.4</version>
+			<version>1.4.5</version>
 		</dependency>
 
 		<dependency>
@@ -87,7 +87,7 @@
 		<dependency>
 			<groupId>org.jpmml</groupId>
 			<artifactId>pmml-evaluator-testing</artifactId>
-			<version>1.5.5</version>
+			<version>1.5.11</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>

src/main/java/org/jpmml/h2o/XGBoostMojoModelConverter.java

@@ -21,20 +21,19 @@
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
-import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import org.dmg.pmml.MissingValueTreatmentMethod;
 import org.dmg.pmml.mining.MiningModel;
 import org.jpmml.converter.BinaryFeature;
 import org.jpmml.converter.CategoricalFeature;
 import org.jpmml.converter.Feature;
 import org.jpmml.converter.Label;
+import org.jpmml.converter.MissingValueFeature;
 import org.jpmml.converter.PMMLEncoder;
 import org.jpmml.converter.Schema;
 import org.jpmml.xgboost.HasXGBoostOptions;
@@ -61,13 +60,14 @@ public Stream<Feature> apply(Feature feature){
 				if(feature instanceof CategoricalFeature){
 					CategoricalFeature categoricalFeature = (CategoricalFeature)feature;
 
-					List<Object> values = new ArrayList<>(categoricalFeature.getValues());
-					values.add("missing(NA)");
+					List<?> values = categoricalFeature.getValues();
 
-					ImputerUtil.encodeFeature(categoricalFeature, "missing(NA)", MissingValueTreatmentMethod.AS_VALUE);
-
-					return values.stream()
+					Stream<Feature> binaryFeaturesStream = values.stream()
 						.map(value -> new BinaryFeature(encoder, categoricalFeature, value));
+
+					Stream<Feature> missingValueFeatureStream = Stream.of(new MissingValueFeature(encoder, categoricalFeature));
+
+					return Stream.concat(binaryFeaturesStream, missingValueFeatureStream);
 				}
 
 				return Stream.of(feature);