splitAtLineEndings method Null safety

Implementation

List<String> splitAtLineEndings() {
  final paragraphs =
      trim().split(RegExp(EnglishConstants.reLineEndingSelector));
  final retVal = <String>[];
  for (final e in paragraphs) {
    final paragraph = e.trim();
    if (paragraph.isNotEmpty) {
      retVal.add(paragraph);
    }
  }
  return retVal;
}