Added missing @PostConstruct annotation

ccm-cms/src/main/java/org/librecms/assets/AbstractContactableEntityImExporter.java

@@ -20,6 +20,8 @@ package org.librecms.assets;
 
 import java.util.Set;
 
+import javax.annotation.PostConstruct;
+
 /**
  *
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
@@ -28,6 +30,7 @@ import java.util.Set;
 public abstract class AbstractContactableEntityImExporter<T extends ContactableEntity>
     extends AbstractAssetImExporter<T> {
 
+    @PostConstruct
     @Override
     protected final void init() {
         addRequiredEntities(Set.of(PostalAddress.class));