message: Fix possible exception on first launch
diff: @@ -57,7 +57,7 @@ namespace Sqlbi.Bravo.UI.Views
  };
  // Creating the tab (& VMs) may not trigger the loaded event when expected
  - ViewModel.AddNewTab(BiConnectionType.ActivePowerBiWindow, ViewModel.SelectedItem.SubPageInTab, runtimeSummary);
  + ViewModel.AddNewTab(BiConnectionType.ActivePowerBiWindow, ViewModel?.SelectedItem?.SubPageInTab ?? SubPage.DaxFormatter, runtimeSummary);
  }
  }
  catch (Exception e)
  