Make NoGames page error code robust to players who never got exitCodes assigned

[sentry-io]

Possibly for players who never get assigned exitcodes (not sure how this can happen)

Sentry Issue: DELIBERATION-EMPIRICA-7C

React ErrorBoundary TypeError: Cannot read properties of undefined (reading 'complete')
  at NoGames (../../src/intro-exit/NoGames.jsx:68:61)
  at InnerParticipant (../../src/App.jsx:42:19)
  at None (div)
  at App (../../src/App.jsx:154:3)
  at BrowserConditionalRender (../../src/components/Layouts.jsx:152:44)
...
(2 additional frame(s) were not displayed)

TypeError: Cannot read properties of undefined (reading 'complete')
  at message (../../src/intro-exit/NoGames.jsx:29:40)
  at NoGames (../../src/intro-exit/NoGames.jsx:68:61)
...
(7 additional frame(s) were not displayed)

[hunxjunedo]

requesting assignment