IDEMPIERE-619 Zk: Always show processing prompt when server is processing login request / Fix problem reported by Hiep Lq

https://groups.google.com/d/topic/idempiere/MkoPalYrOGk/discussion

org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/panel/RolePanel.java

@@ -538,6 +538,7 @@ public class RolePanel extends Window implements EventListener<Event>, Deferrabl
     **/
     public void validateRoles()
     {
+    	Clients.clearBusy();
     	Comboitem lstItemRole = lstRole.getSelectedItem();
     	Comboitem lstItemClient = lstClient.getSelectedItem();
     	Comboitem lstItemOrg = lstOrganisation.getSelectedItem();