CCM NG/ccm-cms: Added clearOptions call

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@4791 8810af33-2d31-482b-a856-94f89814c4df

ccm-cms/src/main/java/com/arsdigita/cms/ui/ListOptionPrintListener.java

@@ -47,6 +47,8 @@ public abstract class ListOptionPrintListener<T> implements PrintListener {
         final OptionGroup target = (OptionGroup) event.getTarget();
         final List<T> dataQuery = getDataQuery(state);
 
+        target.clearOptions();
+        
         dataQuery.forEach(item -> target.addOption(
             new Option(getKey(item),
                        getValue(item))));