Program: 69995
Project: 69995
Buggy source:
private void initialize(UserRequest ureq){
  mainVc=createVelocityContainer("String_Node_Str");
  navVc=createVelocityContainer("String_Node_Str");
  mainVc.put("String_Node_Str",navVc);
  guimsgVc=createVelocityContainer("String_Node_Str");
  guimsgVc.contextPut("String_Node_Str",guiMessage);
  guimsgHolder=new Panel("String_Node_Str");
  guimsgHolder.setContent(guimsgPanel);
  currentMsgHolder=guimsgHolder;
  mainVc.put("String_Node_Str",guimsgHolder);
  dtabs=new ArrayList<DTab>();
  dtabsLinkNames=new ArrayList<String>();
  dtabsControllers=new ArrayList<Controller>();
  sites=baseFullWebappControllerParts.getSiteInstances(ureq,getWindowControl());
  if (sites != null && sites.size() == 0) {
    sites=null;
  }
  if (sites != null) {
    for (Iterator<SiteInstance> iterator=sites.iterator(); iterator.hasNext(); ) {
      SiteInstance si=iterator.next();
      Link link=LinkFactory.createCustomLink("String_Node_Str" + navLinkCounter,"String_Node_Str","String_Node_Str",Link.NONTRANSLATED,navVc,this);
      link.setCustomDisplayText(si.getNavElement().getTitle());
      link.setTitle(si.getNavElement().getDescription());
      link.setUserObject(si);
      Character accessKey=si.getNavElement().getAccessKey();
      if (accessKey != null && StringHelper.containsNonWhitespace(accessKey.toString())) {
        link.setAccessKey(accessKey.toString());
      }
      navLinkCounter++;
    }
  }
  navVc.contextPut("String_Node_Str",sites);
  navVc.contextPut("String_Node_Str",dtabs);
  navVc.contextPut("String_Node_Str",dtabsLinkNames);
  navVc.contextPut("String_Node_Str",this);
  headerCtr=baseFullWebappControllerParts.createHeaderController(ureq,getWindowControl());
  if (headerCtr != null) {
    listenTo(headerCtr);
    mainVc.put("String_Node_Str",headerCtr.getInitialComponent());
  }
  topnavCtr=baseFullWebappControllerParts.createTopNavController(ureq,getWindowControl());
  if (topnavCtr != null) {
    listenTo(topnavCtr);
    mainVc.put("String_Node_Str",topnavCtr.getInitialComponent());
  }
  modalPanel=new Panel("String_Node_Str");
  mainVc.put("String_Node_Str",modalPanel);
  main=new Panel("String_Node_Str");
  mainVc.put("String_Node_Str",main);
  footerCtr=baseFullWebappControllerParts.createFooterController(ureq,getWindowControl());
  if (footerCtr != null) {
    listenTo(footerCtr);
    mainVc.put("String_Node_Str",footerCtr.getInitialComponent());
  }
  contentCtrl=baseFullWebappControllerParts.getContentController(ureq,getWindowControl());
  if (contentCtrl != null) {
    listenTo(contentCtrl);
    GuiStack gs=getWindowControl().getWindowBackOffice().createGuiStack(contentCtrl.getInitialComponent());
    setGuiStack(gs);
    main.setContent(contentCtrl.getInitialComponent());
  }
  if (sites != null) {
    prevSite=sites.get(0);
    if (contentCtrl == null) {
      activateSite(sites.get(0),ureq,null,null);
    }
  }
  if (sites == null && contentCtrl == null) {
    main.setContent(TextFactory.createTextComponentFromString("String_Node_Str","String_Node_Str",null,false,null));
  }
  String stickyMessage=GlobalStickyMessage.getGlobalStickyMessage();
  this.mainVc.contextPut("String_Node_Str",(stickyMessage == null ? Boolean.FALSE : Boolean.TRUE));
  this.mainVc.contextPut("String_Node_Str",stickyMessage);
  addCustomThemeJS();
}

Fixed version (ground truth):
private void initialize(UserRequest ureq){
  mainVc=createVelocityContainer("String_Node_Str");
  navVc=createVelocityContainer("String_Node_Str");
  mainVc.put("String_Node_Str",navVc);
  guimsgVc=createVelocityContainer("String_Node_Str");
  guimsgVc.contextPut("String_Node_Str",guiMessage);
  guimsgHolder=new Panel("String_Node_Str");
  guimsgHolder.setContent(guimsgPanel);
  currentMsgHolder=guimsgHolder;
  mainVc.put("String_Node_Str",guimsgHolder);
  dtabs=new ArrayList<DTab>();
  dtabsLinkNames=new ArrayList<String>();
  dtabsControllers=new ArrayList<Controller>();
  sites=baseFullWebappControllerParts.getSiteInstances(ureq,getWindowControl());
  if (sites != null && sites.size() == 0) {
    sites=null;
  }
  if (sites != null) {
    for (Iterator<SiteInstance> iterator=sites.iterator(); iterator.hasNext(); ) {
      SiteInstance si=iterator.next();
      Link link=LinkFactory.createCustomLink("String_Node_Str" + navLinkCounter,"String_Node_Str","String_Node_Str",Link.NONTRANSLATED,navVc,this);
      link.setCustomDisplayText(si.getNavElement().getTitle());
      link.setTitle(si.getNavElement().getDescription());
      link.setUserObject(si);
      Character accessKey=si.getNavElement().getAccessKey();
      if (accessKey != null && StringHelper.containsNonWhitespace(accessKey.toString())) {
        link.setAccessKey(accessKey.toString());
      }
      navLinkCounter++;
    }
  }
  navVc.contextPut("String_Node_Str",sites);
  navVc.contextPut("String_Node_Str",dtabs);
  navVc.contextPut("String_Node_Str",dtabsLinkNames);
  navVc.contextPut("String_Node_Str",this);
  headerCtr=baseFullWebappControllerParts.createHeaderController(ureq,getWindowControl());
  if (headerCtr != null) {
    listenTo(headerCtr);
    mainVc.put("String_Node_Str",headerCtr.getInitialComponent());
  }
  topnavCtr=baseFullWebappControllerParts.createTopNavController(ureq,getWindowControl());
  if (topnavCtr != null) {
    listenTo(topnavCtr);
    mainVc.put("String_Node_Str",topnavCtr.getInitialComponent());
  }
  modalPanel=new Panel("String_Node_Str");
  mainVc.put("String_Node_Str",modalPanel);
  main=new Panel("String_Node_Str");
  mainVc.put("String_Node_Str",main);
  footerCtr=baseFullWebappControllerParts.createFooterController(ureq,getWindowControl());
  if (footerCtr != null) {
    listenTo(footerCtr);
    mainVc.put("String_Node_Str",footerCtr.getInitialComponent());
  }
  contentCtrl=baseFullWebappControllerParts.getContentController(ureq,getWindowControl());
  if (contentCtrl != null) {
    listenTo(contentCtrl);
    GuiStack gs=getWindowControl().getWindowBackOffice().createGuiStack(contentCtrl.getInitialComponent());
    setGuiStack(gs);
    main.setContent(contentCtrl.getInitialComponent());
  }
  if (sites != null) {
    prevSite=sites.get(0);
    if (contentCtrl == null) {
      activateSite(prevSite,ureq,null,null);
      siteToBusinessPath.put(prevSite,ureq.getUserSession().getLastHistoryPoint());
    }
  }
  if (sites == null && contentCtrl == null) {
    main.setContent(TextFactory.createTextComponentFromString("String_Node_Str","String_Node_Str",null,false,null));
  }
  String stickyMessage=GlobalStickyMessage.getGlobalStickyMessage();
  this.mainVc.contextPut("String_Node_Str",(stickyMessage == null ? Boolean.FALSE : Boolean.TRUE));
  this.mainVc.contextPut("String_Node_Str",stickyMessage);
  addCustomThemeJS();
}