isNullOrEmpty function

Implementation

bool isNullOrEmpty(dynamic s) {
  try {
    if (s == null || s == 'null') return true;
    if (s is String) {
      s = s.trim();
      if (s == '') return true;
    }
    if (s is List) return (s.isEmpty);
  } catch (e) {
    return true;
  }
  return false;
}