fix double open tab bug

scm-webapp/src/main/webapp/resources/js/sonia.scm.js

@@ -92,6 +92,8 @@ Ext.onReady(function(){
 
   // adds a tab to main TabPanel
   function addTabPanel(id, xtype, title){
+    var tab = mainTabPanel.findById( id );
+    if ( tab == null ){
       mainTabPanel.add({
         id: id,
         xtype: xtype,
@@ -99,6 +101,7 @@ Ext.onReady(function(){
         closable: true,
         autoScroll: true
       });
+    }
     mainTabPanel.setActiveTab(id);
   }