message: Disable save/close capture menu items when there's no capture open
diff: @@ -205,6 +205,9 @@ MainWindow::MainWindow(ICaptureContext &ctx) : QMainWindow(NULL), ui(new Ui::Mai
  m_Ctx.AddLogViewer(this);
  + ui->action_Save_Log->setEnabled(false);
  + ui->action_Close_Log->setEnabled(false);
  +
  QList<QAction *> actions = ui->menuBar->actions();
  // register all the UI-designer created shortcut keys
  @@ -1233,6 +1236,9 @@ void MainWindow::statusDoubleClicked(QMouseEvent *event)
  void MainWindow::OnLogfileLoaded()
  {
  + ui->action_Save_Log->setEnabled(true);
  + ui->action_Close_Log->setEnabled(true);
  +
  // don't allow changing context while log is open
  contextChooser->setEnabled(false);
  @@ -1261,6 +1267,9 @@ void MainWindow::OnLogfileLoaded()
  void MainWindow::OnLogfileClosed()
  {
  + ui->action_Save_Log->setEnabled(false);
  + ui->action_Close_Log->setEnabled(false);
  +
  contextChooser->setEnabled(true);
  statusText->setText(QString());
  