message: Handle switch to tab binding even if tab doesn't exist
  Closes
diff: @@ -252,8 +252,8 @@ namespace winrt::TerminalApp::implementation
  {
  if (const auto& realArgs = args.ActionArgs().try_as<SwitchToTabArgs>())
  {
  - const auto handled = _SelectTab({ realArgs.TabIndex() });
  - args.Handled(handled);
  + _SelectTab({ realArgs.TabIndex() });
  + args.Handled(true);
  }
  }
  