Allow all @default annotation values for unions (#152)

* Refs #21313: Allow all @default annotation values for unions

Signed-off-by: eduponz <eduardoponz@eprosima.com>

* Refs #21313: Apply Miguel's suggestions

Signed-off-by: eduponz <eduardoponz@eprosima.com>

---------

Signed-off-by: eduponz <eduardoponz@eprosima.com>

src/main/java/com/eprosima/idl/parser/typecode/UnionTypeCode.java

@@ -172,16 +172,12 @@ public int addMember(
      * @default annotation. If no one then return \b null.
      * @return The union's member that passes the conditions or \b null value.
      */
-    public Member getDefaultAnnotatedMember() throws RuntimeGenerationException
+    public Member getDefaultAnnotatedMember()
     {
         if (m_defaultannotated_index != -1)
         {
             return getMembers().get(m_defaultannotated_index);
         }
-        else if (discriminator_.isAnnotationDefault())
-        {
-            throw new RuntimeGenerationException("UnionTypeCode::getDefaultAnnotatedMember(): Discriminator has a default value but that value was not found in label cases");
-        }
 
         return null;
     }