Invalid authentication sent to Robotoff during question answering

[raphael0202]

See https://sentry.io/organizations/openfoodfacts/issues/3749073432/events/2638e00077e54c64abf983aaedb71838/?project=1415205&referrer=previous-event

'null' is sometimes sent as username in during /insights/annotate call.

[monsieurtanuki]

@raphael0202 Actually there are expected cases when the user is null, branded as "anonymousAnnotation" (in question_page.dart):

    if (OpenFoodAPIConfiguration.globalUser == null && insightId != null) {
      _anonymousAnnotationList.putIfAbsent(insightId, () => insightAnnotation);
    }
    await LoadingDialog.run<Status>(
      context: context,
      title: appLocalizations.saving_answer,
      future: OpenFoodAPIClient.postInsightAnnotation(
        insightId,
        insightAnnotation,
        deviceId: OpenFoodAPIConfiguration.uuid,
        user: OpenFoodAPIConfiguration.globalUser,
      ),
    );

There has been some refactoring here, so it's not easy to follow the history: which user should we use for those anonymous annotations?

[raphael0202]

No authentication headers should be sent for anonymous annotations. The documentation is not up to date on that matter, sorry for that!