yang choice case translator + whitebox fix

Change-Id: I96f1855bc71a002335946150b51e911ae6ac2fb2
diff --git a/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java b/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
index 5a25762..1d2a698 100644
--- a/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
+++ b/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
@@ -51,7 +51,6 @@
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
-import org.onosproject.yangutils.utils.YangConstructType;
 
 import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
 import static org.onosproject.yangutils.datamodel.utils.YangDataModelFactory.getYangUnionNode;
@@ -214,7 +213,7 @@
                 curNode.addChild(unionNode);
             } catch (DataModelException e) {
                 throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
-                        YangConstructType.UNION_DATA, "", ENTRY, e.getMessage()));
+                        UNION_DATA, "", ENTRY, e.getMessage()));
             }
         }
     }