message: Error handler: Don't fail if event.error is undefined
diff: @@ -170,7 +170,7 @@ try {
  debug_info.code_version = CODE_VERSION;
  debug_info.user_agent = window.navigator.userAgent;
  debug_info.url = window.location;
  - debug_info.error.context = event.error.context;
  + debug_info.error.context = event.error?.context;
  logError(event, debug_info);
  @@ -186,7 +186,7 @@ try {
  const mailto_url = `mailto:dev@datenanfragen.de?subject=${report_title}&body=${email_body}`;
  if (!debug_info.error.code || debug_info.error.code <= 3) {
  - primitiveErrorModal(event.error.enduser_message, github_issue_url, mailto_url);
  + primitiveErrorModal(event.error?.enduser_message, github_issue_url, mailto_url);
  previous_github_report_body = github_body + encodeURIComponent('\n\n---\n\n');
  previous_email_report_body = email_body + encodeURIComponent('\n\n---\n\n');
  }
  