avoid error popup at new vc

src/main/java/fr/soleil/mambo/containers/view/dialogs/GeneralTab.java

@@ -256,19 +256,16 @@ public class GeneralTab extends JPanel implements ItemListener {
         msg = Messages.getMessage("DATABASE_HDB");
         hdbButton = new JRadioButton(msg);
         hdbButton.setSelected(Boolean.TRUE.equals(historic));
-        hdbButton.addItemListener(this);
         dbButtonGroup.add(hdbButton);
 
         msg = Messages.getMessage("DATABASE_TDB");
         tdbButton = new JRadioButton(msg);
         tdbButton.setSelected(Boolean.FALSE.equals(historic));
-        tdbButton.addItemListener(this);
         dbButtonGroup.add(tdbButton);
 
         msg = Messages.getMessage("DATABASE_TTS");
         ttsButton = new JRadioButton(msg);
         ttsButton.setSelected(historic == null);
-        ttsButton.addItemListener(this);
         dbButtonGroup.add(ttsButton);
 
         msg = Messages.getMessage("DIALOGS_EDIT_VC_GENERAL_NAME");
@@ -291,6 +288,9 @@ public class GeneralTab extends JPanel implements ItemListener {
                         dateRangeBox.getDateRangeComboBoxListener().getLast1h(), ItemEvent.SELECTED));
         // must be after initialization of DateRangeBox
         initializeHistoricCheck();
+        hdbButton.addItemListener(this);
+        tdbButton.addItemListener(this);
+        ttsButton.addItemListener(this);
 
         chartGeneralTabbedPane = new ChartGeneralTabbedPane();
         chartGeneralTabbedPane