Some bugfixes for import

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/Contact.java

@@ -69,6 +69,7 @@ public class Contact implements Exportable, Serializable {
         this.contactId = contactId;
     }
 
+    @Override
     public String getUuid() {
         return uuid;
     }

sci-types-project/src/main/java/org/scientificcms/contenttypes/sciproject/ContactRepository.java

@@ -38,7 +38,7 @@ public class ContactRepository
 
     @Override
     public boolean isNew(final Contact contact) {
-        return contact.getContactId() == 0;
+        return contact.getContactId() == 0 || contact.getUuid() == null;
     }
     
     @Override