message: fix: guard against undefined new breadcrumbs in `handleScope`
diff: @@ -9,7 +9,7 @@ export function handleScope(scope: Scope) {
  // Listener can be called when breadcrumbs have not changed, so we store the
  // reference to the last crumb and only return a crumb if it has changed
  - if (_LAST_BREADCRUMB === newBreadcrumb) {
  + if (_LAST_BREADCRUMB === newBreadcrumb || !newBreadcrumb) {
  return null;
  }
  